{"id":695,"date":"2026-06-19T16:52:28","date_gmt":"2026-06-19T09:52:28","guid":{"rendered":"https:\/\/www.299engineering.co.th\/?p=695"},"modified":"2026-06-30T17:01:19","modified_gmt":"2026-06-30T10:01:19","slug":"%e0%b8%a1%e0%b8%ab%e0%b8%b2%e0%b8%81%e0%b8%b2%e0%b8%9e%e0%b8%a2%e0%b9%8c%e0%b8%84%e0%b8%a7%e0%b8%b2%e0%b8%a1%e0%b8%aa%e0%b8%b1%e0%b8%9a%e0%b8%aa%e0%b8%99%e0%b8%82%e0%b8%ad%e0%b8%87-rs-232-rs-232c","status":"publish","type":"post","link":"https:\/\/www.299engineering.co.th\/?p=695","title":{"rendered":"\u0e21\u0e2b\u0e32\u0e01\u0e32\u0e1e\u0e22\u0e4c\u0e04\u0e27\u0e32\u0e21\u0e2a\u0e31\u0e1a\u0e2a\u0e19\u0e02\u0e2d\u0e07 RS-232 \/ RS-232C \/ RS-422 \/ RS-485 (\u0e15\u0e2d\u0e19\u0e17\u0e35\u0e48 1)"},"content":{"rendered":"\n<figure class=\"wp-block-image size-full is-resized\"><a href=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image.png\"><img loading=\"lazy\" decoding=\"async\" width=\"665\" height=\"435\" src=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image.png\" alt=\"\" class=\"wp-image-700\" style=\"width:459px;height:auto\" srcset=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image.png 665w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-300x196.png 300w\" sizes=\"auto, (max-width: 665px) 100vw, 665px\" \/><\/a><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e2a\u0e21\u0e1e\u0e07\u0e29\u0e4c \u0e27\u0e34\u0e28\u0e27\u0e01\u0e23\u0e42\u0e23\u0e07\u0e07\u0e32\u0e19\u0e21\u0e37\u0e2d\u0e43\u0e2b\u0e21\u0e48\u0e04\u0e19\u0e2b\u0e19\u0e36\u0e48\u0e07 \u0e40\u0e1c\u0e0a\u0e34\u0e0d\u0e01\u0e31\u0e1a\u0e1b\u0e31\u0e0d\u0e2b\u0e32 Inverter \u0e44\u0e21\u0e48\u0e17\u0e33\u0e07\u0e32\u0e19 \u0e40\u0e02\u0e32\u0e15\u0e23\u0e27\u0e08\u0e1e\u0e1a\u0e27\u0e48\u0e32 \u0e2a\u0e32\u0e22\u0e40\u0e0a\u0e37\u0e48\u0e2d\u0e21\u0e15\u0e48\u0e2d\u0e23\u0e30\u0e2b\u0e27\u0e48\u0e32\u0e07 PLC \u0e01\u0e31\u0e1a Inverter \u0e19\u0e31\u0e49\u0e19\u0e40\u0e2a\u0e35\u0e22 \u0e40\u0e02\u0e32\u0e40\u0e2b\u0e47\u0e19\u0e27\u0e48\u0e32\u0e2a\u0e32\u0e22\u0e19\u0e31\u0e49\u0e19\u0e40\u0e1b\u0e47\u0e19\u0e41\u0e1a\u0e1a RS-232 \u0e17\u0e31\u0e48\u0e27\u0e44\u0e1b \u0e40\u0e02\u0e32\u0e08\u0e36\u0e07\u0e2a\u0e31\u0e48\u0e07\u0e0b\u0e37\u0e49\u0e2d\u0e43\u0e2b\u0e21\u0e48 \u0e40\u0e21\u0e37\u0e48\u0e2d\u0e02\u0e2d\u0e07\u0e21\u0e32 \u0e40\u0e02\u0e32\u0e40\u0e2d\u0e32\u0e21\u0e32\u0e15\u0e48\u0e2d \u0e1b\u0e23\u0e32\u0e01\u0e0f\u0e27\u0e48\u0e32\u0e21\u0e31\u0e19\u0e01\u0e47\u0e22\u0e31\u0e07\u0e44\u0e21\u0e48\u0e17\u0e33\u0e07\u0e32\u0e19 \u0e40\u0e02\u0e32\u0e40\u0e2b\u0e07\u0e37\u0e48\u0e2d\u0e41\u0e15\u0e01\u0e1e\u0e25\u0e31\u0e01\u0e46 \u0e40\u0e19\u0e37\u0e48\u0e2d\u0e07\u0e08\u0e32\u0e01\u0e25\u0e39\u0e01\u0e1e\u0e35\u0e48\u0e21\u0e32\u0e22\u0e37\u0e19\u0e01\u0e14\u0e14\u0e31\u0e19 \u0e41\u0e25\u0e30\u0e25\u0e39\u0e01\u0e04\u0e49\u0e32\u0e01\u0e47\u0e40\u0e23\u0e48\u0e07\u0e40\u0e19\u0e37\u0e48\u0e2d\u0e07\u0e08\u0e32\u0e01\u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e1c\u0e25\u0e34\u0e15\u0e07\u0e32\u0e19\u0e44\u0e21\u0e48\u0e44\u0e14\u0e49\u0e2b\u0e25\u0e32\u0e22\u0e27\u0e31\u0e19\u0e41\u0e25\u0e49\u0e27<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e40\u0e02\u0e32\u0e16\u0e48\u0e32\u0e22\u0e23\u0e39\u0e1b\u0e16\u0e32\u0e21 ChatGPT \u0e40\u0e27\u0e2d\u0e23\u0e4c\u0e0a\u0e31\u0e48\u0e19\u0e1f\u0e23\u0e35 \u0e41\u0e15\u0e48\u0e01\u0e47\u0e1c\u0e34\u0e14\u0e2b\u0e27\u0e31\u0e07\u0e40\u0e25\u0e47\u0e01\u0e19\u0e49\u0e2d\u0e22 \u0e40\u0e21\u0e37\u0e48\u0e2d\u0e41\u0e2d\u0e1e\u0e08\u0e33\u0e01\u0e31\u0e14\u0e01\u0e32\u0e23\u0e41\u0e0a\u0e47\u0e17\u0e41\u0e25\u0e49\u0e27 \u0e40\u0e02\u0e32\u0e08\u0e36\u0e07\u0e1e\u0e34\u0e21\u0e1e\u0e4c\u0e23\u0e38\u0e48\u0e19 PLC, Inverter \u0e16\u0e32\u0e21 AI \u0e04\u0e48\u0e32\u0e22\u0e2d\u0e37\u0e48\u0e19\u0e46<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">AI \u0e1a\u0e2d\u0e01\u0e27\u0e48\u0e32 \u0e2b\u0e31\u0e27\u0e15\u0e48\u0e2d\u0e40\u0e1b\u0e47\u0e19 DB9 \u0e41\u0e15\u0e48\u0e2a\u0e31\u0e0d\u0e0d\u0e32\u0e13\u0e2a\u0e37\u0e48\u0e2d\u0e2a\u0e32\u0e23\u0e17\u0e35\u0e48\u0e43\u0e0a\u0e49\u0e40\u0e1b\u0e47\u0e19\u0e44\u0e1b\u0e44\u0e14\u0e49\u0e2b\u0e25\u0e32\u0e22\u0e41\u0e1a\u0e1a \u0e43\u0e2b\u0e49\u0e40\u0e0a\u0e47\u0e04\u0e04\u0e39\u0e48\u0e21\u0e37\u0e2d\u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e08\u0e31\u0e01\u0e23 \u0e27\u0e48\u0e32\u0e2a\u0e31\u0e0d\u0e0d\u0e32\u0e13\u0e2a\u0e37\u0e48\u0e2d\u0e2a\u0e32\u0e23\u0e17\u0e35\u0e48\u0e43\u0e0a\u0e49\u0e40\u0e1b\u0e47\u0e19\u0e41\u0e1a\u0e1a\u0e43\u0e14 \u0e40\u0e19\u0e37\u0e48\u0e2d\u0e07\u0e08\u0e32\u0e01\u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e08\u0e31\u0e01\u0e23\u0e40\u0e1b\u0e47\u0e19\u0e23\u0e38\u0e48\u0e19\u0e40\u0e01\u0e48\u0e32 \u0e02\u0e49\u0e2d\u0e21\u0e39\u0e25\u0e17\u0e35\u0e48\u0e44\u0e14\u0e49\u0e08\u0e32\u0e01 AI \u0e44\u0e21\u0e48\u0e04\u0e48\u0e2d\u0e22\u0e0a\u0e31\u0e14\u0e40\u0e08\u0e19\u0e19\u0e31\u0e01<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e40\u0e02\u0e32\u0e44\u0e1b\u0e04\u0e49\u0e19\u0e40\u0e25\u0e48\u0e21\u0e04\u0e39\u0e48\u0e21\u0e37\u0e2d \u0e44\u0e25\u0e48\u0e14\u0e39\u0e2a\u0e31\u0e01\u0e1e\u0e31\u0e01 \u0e40\u0e08\u0e2d\u0e21\u0e31\u0e19\u0e40\u0e02\u0e35\u0e22\u0e19\u0e1a\u0e2d\u0e01\u0e27\u0e48\u0e32\u0e40\u0e1b\u0e47\u0e19 RS485 \u0e2a\u0e21\u0e1e\u0e07\u0e29\u0e4c\u0e44\u0e21\u0e48\u0e23\u0e2d\u0e0a\u0e49\u0e32 \u0e04\u0e49\u0e19\u0e2b\u0e32\u0e2a\u0e32\u0e22\u0e17\u0e35\u0e48\u0e08\u0e30\u0e0b\u0e37\u0e49\u0e2d\u0e40\u0e1b\u0e47\u0e19 RS485 \u0e17\u0e35\u0e48\u0e40\u0e1b\u0e47\u0e19\u0e2b\u0e31\u0e27 DB9 \u0e43\u0e19 Google \u0e1b\u0e23\u0e32\u0e01\u0e0f\u0e27\u0e48\u0e32\u0e21\u0e31\u0e19\u0e02\u0e36\u0e49\u0e19\u0e21\u0e32\u0e40\u0e15\u0e47\u0e21\u0e44\u0e1b\u0e2b\u0e21\u0e14 \u0e44\u0e21\u0e48\u0e23\u0e39\u0e49\u0e27\u0e48\u0e32\u0e15\u0e49\u0e2d\u0e07\u0e0b\u0e37\u0e49\u0e2d\u0e41\u0e1a\u0e1a\u0e44\u0e2b\u0e19 \u0e40\u0e1e\u0e23\u0e32\u0e30\u0e2d\u0e38\u0e1b\u0e01\u0e23\u0e13\u0e4c\u0e41\u0e15\u0e48\u0e25\u0e30\u0e15\u0e31\u0e27\u0e2d\u0e32\u0e08\u0e43\u0e0a\u0e49\u0e44\u0e21\u0e48\u0e40\u0e2b\u0e21\u0e37\u0e2d\u0e19\u0e01\u0e31\u0e19<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e2b\u0e25\u0e32\u0e22\u0e04\u0e19\u0e40\u0e1b\u0e47\u0e19\u0e41\u0e1a\u0e1a\u0e2a\u0e21\u0e1e\u0e07\u0e29\u0e4c \u0e0a\u0e2d\u0e1a\u0e21\u0e35\u0e1b\u0e31\u0e0d\u0e2b\u0e32\u0e01\u0e31\u0e1a\u0e40\u0e08\u0e49\u0e32\u0e2a\u0e32\u0e22 RS-232 \/ RS-232C \/ RS-422 \/ RS-485 \u0e41\u0e25\u0e30\u0e2a\u0e31\u0e1a\u0e2a\u0e19\u0e01\u0e31\u0e1a MODBUS RTU\/TCP CC-LINK MC-Protocol &#8230;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e27\u0e31\u0e19\u0e19\u0e35\u0e49\u0e08\u0e30\u0e40\u0e2d\u0e32\u0e43\u0e2b\u0e49\u0e2b\u0e32\u0e22\u0e07\u0e07 \u0e2b\u0e32\u0e22\u0e2a\u0e07\u0e2a\u0e31\u0e22 \u0e44\u0e14\u0e49\u0e01\u0e23\u0e30\u0e08\u0e48\u0e32\u0e07\u0e41\u0e08\u0e49\u0e07 \u0e43\u0e19\u0e2a\u0e34\u0e48\u0e07\u0e17\u0e35\u0e48\u0e04\u0e32\u0e2b\u0e31\u0e27\u0e21\u0e32\u0e19\u0e32\u0e19<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e01\u0e48\u0e2d\u0e19\u0e17\u0e35\u0e48\u0e08\u0e30\u0e16\u0e32\u0e21\u0e27\u0e48\u0e32 \u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e08\u0e31\u0e01\u0e23\u0e21\u0e31\u0e19\u0e04\u0e38\u0e22\u0e01\u0e31\u0e19\u0e22\u0e31\u0e07\u0e44\u0e07 \u0e25\u0e2d\u0e07\u0e19\u0e36\u0e01\u0e20\u0e32\u0e1e\u0e04\u0e19\u0e2a\u0e2d\u0e07\u0e04\u0e19\u0e04\u0e38\u0e22\u0e01\u0e31\u0e19\u0e01\u0e48\u0e2d\u0e19<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\u0e1e\u0e39\u0e14\u0e2d\u0e2d\u0e01\u0e40\u0e2a\u0e35\u0e22\u0e07 \u2192 \u0e2b\u0e39\u0e41\u0e1b\u0e25\u0e07\u0e04\u0e27\u0e32\u0e21\u0e16\u0e35\u0e48\u0e40\u0e2a\u0e35\u0e22\u0e07\u0e40\u0e1b\u0e47\u0e19\u0e20\u0e32\u0e29\u0e32<br>\u0e20\u0e32\u0e29\u0e32\u0e40\u0e14\u0e35\u0e22\u0e27\u0e01\u0e31\u0e19 \u2192 \u0e40\u0e02\u0e49\u0e32\u0e43\u0e08\u0e01\u0e31\u0e19 (protocol)<br>\u0e40\u0e2a\u0e35\u0e22\u0e07\u0e14\u0e31\u0e07\u0e1e\u0e2d \u2192 \u0e44\u0e14\u0e49\u0e22\u0e34\u0e19 (voltage\/signal level)<br>\u0e1e\u0e39\u0e14\u0e17\u0e35\u0e25\u0e30\u0e04\u0e19 \u2192 \u0e44\u0e21\u0e48\u0e0a\u0e19\u0e01\u0e31\u0e19 (timing)<br>\u0e2a\u0e32\u0e22\u0e42\u0e17\u0e23\u0e28\u0e31\u0e1e\u0e17\u0e4c \u2192 \u0e0a\u0e48\u0e2d\u0e07\u0e17\u0e32\u0e07\u0e2a\u0e48\u0e07\u0e02\u0e49\u0e2d\u0e21\u0e39\u0e25 (physical layer)<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e08\u0e31\u0e01\u0e23\u0e01\u0e47\u0e04\u0e38\u0e22\u0e01\u0e31\u0e19\u0e04\u0e25\u0e49\u0e32\u0e22\u0e46 \u0e04\u0e19<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e04\u0e19\u0e04\u0e38\u0e22\u0e01\u0e31\u0e19\u0e14\u0e49\u0e27\u0e22\u0e04\u0e27\u0e32\u0e21\u0e16\u0e35\u0e48\u0e40\u0e2a\u0e35\u0e22\u0e07 \u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e04\u0e38\u0e22\u0e01\u0e31\u0e19\u0e14\u0e49\u0e27\u0e22\u0e2a\u0e31\u0e0d\u0e0d\u0e32\u0e13 Digital<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Digital communication (\u0e01\u0e32\u0e23\u0e2a\u0e37\u0e48\u0e2d\u0e2a\u0e32\u0e23\u0e14\u0e34\u0e08\u0e34\u0e17\u0e31\u0e25) \u0e04\u0e37\u0e2d \u201c\u0e01\u0e32\u0e23\u0e2a\u0e48\u0e07\u0e02\u0e49\u0e2d\u0e21\u0e39\u0e25\u0e41\u0e1a\u0e1a\u0e40\u0e25\u0e02 0 \u0e41\u0e25\u0e30 1\u201d \u0e23\u0e30\u0e2b\u0e27\u0e48\u0e32\u0e07\u0e2d\u0e38\u0e1b\u0e01\u0e23\u0e13\u0e4c \u0e40\u0e0a\u0e48\u0e19 PLC, sensor, inverter, HMI, computer \u0e2b\u0e23\u0e37\u0e2d network \u0e15\u0e48\u0e32\u0e07 \u0e46<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e16\u0e49\u0e32\u0e04\u0e38\u0e13\u0e17\u0e33 PLC\/\u0e23\u0e30\u0e1a\u0e1a\u0e04\u0e27\u0e1a\u0e04\u0e38\u0e21\u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e08\u0e31\u0e01\u0e23\u0e2d\u0e22\u0e39\u0e48 \u0e43\u0e2b\u0e49\u0e21\u0e2d\u0e07\u0e27\u0e48\u0e32 digital communication \u0e04\u0e37\u0e2d \u201c\u0e20\u0e32\u0e29\u0e32\u0e04\u0e38\u0e22\u0e01\u0e31\u0e19\u0e02\u0e2d\u0e07\u0e2d\u0e38\u0e1b\u0e01\u0e23\u0e13\u0e4c\u201d \u0e27\u0e48\u0e32\u0e43\u0e04\u0e23\u0e1e\u0e39\u0e14\u0e2d\u0e30\u0e44\u0e23 \u0e40\u0e21\u0e37\u0e48\u0e2d\u0e44\u0e23 \u0e41\u0e25\u0e30\u0e1c\u0e48\u0e32\u0e19\u0e2a\u0e32\u0e22\u0e2d\u0e30\u0e44\u0e23<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e43\u0e19\u0e23\u0e30\u0e1a\u0e1a\u0e14\u0e34\u0e08\u0e34\u0e17\u0e31\u0e25 \u0e02\u0e49\u0e2d\u0e21\u0e39\u0e25\u0e08\u0e23\u0e34\u0e07 \u0e46 \u0e16\u0e39\u0e01\u0e2a\u0e48\u0e07\u0e40\u0e1b\u0e47\u0e19\u0e1a\u0e34\u0e15:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">01010011<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">8 \u0e1a\u0e34\u0e15 = 1 byte<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e40\u0e0a\u0e48\u0e19\u0e15\u0e31\u0e27\u0e2d\u0e31\u0e01\u0e29\u0e23 A<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">A = 01000001<\/pre>\n\n\n\n<h1 class=\"wp-block-heading\">1. \u0e1e\u0e37\u0e49\u0e19\u0e10\u0e32\u0e19\u0e17\u0e35\u0e48\u0e2a\u0e38\u0e14: Analog vs Digital<\/h1>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"385\" height=\"379\" src=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-1.png\" alt=\"\" class=\"wp-image-702\" srcset=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-1.png 385w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-1-300x295.png 300w\" sizes=\"auto, (max-width: 385px) 100vw, 385px\" \/><figcaption class=\"wp-element-caption\"><a href=\"https:\/\/www.scimath.org\/article-physics\/item\/4819-analog-digital\">https:\/\/www.scimath.org\/article-physics\/item\/4819-analog-digital<\/a><\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Analog<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e2a\u0e31\u0e0d\u0e0d\u0e32\u0e13\u0e40\u0e1b\u0e25\u0e35\u0e48\u0e22\u0e19\u0e15\u0e48\u0e2d\u0e40\u0e19\u0e37\u0e48\u0e2d\u0e07<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e40\u0e0a\u0e48\u0e19 0\u201310V<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>2.35V<br>2.36V<br>2.37V<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e43\u0e0a\u0e49\u0e43\u0e19 sensor, pressure, temperature<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Digital<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e21\u0e35\u0e2a\u0e16\u0e32\u0e19\u0e30\u0e0a\u0e31\u0e14\u0e40\u0e08\u0e19<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>0 = LOW<br>1 = HIGH<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e15\u0e31\u0e27\u0e2d\u0e22\u0e48\u0e32\u0e07<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>0V = OFF<br>24V = ON<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e41\u0e15\u0e48\u0e43\u0e19\u0e01\u0e32\u0e23\u0e2a\u0e37\u0e48\u0e2d\u0e2a\u0e32\u0e23 digital \u0e21\u0e31\u0e19\u0e43\u0e0a\u0e49 0\/1 \u0e2b\u0e25\u0e32\u0e22\u0e1a\u0e34\u0e15\u0e40\u0e23\u0e35\u0e22\u0e07\u0e02\u0e1a\u0e27\u0e19\u0e40\u0e1b\u0e47\u0e19\u0e02\u0e49\u0e2d\u0e21\u0e39\u0e25<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">2. \u0e1a\u0e34\u0e15 (Bit) \u0e41\u0e25\u0e30\u0e44\u0e1a\u0e15\u0e4c (Byte)<\/h1>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"472\" height=\"163\" src=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-2.png\" alt=\"\" class=\"wp-image-703\" srcset=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-2.png 472w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-2-300x104.png 300w\" sizes=\"auto, (max-width: 472px) 100vw, 472px\" \/><figcaption class=\"wp-element-caption\"><a href=\"https:\/\/www.nsm.or.th\/nsm\/th\/node\/4324\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/www.nsm.or.th\/nsm\/th\/node\/4324<\/a><\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Bit \u0e04\u0e37\u0e2d\u0e2b\u0e19\u0e48\u0e27\u0e22\u0e40\u0e25\u0e47\u0e01\u0e2a\u0e38\u0e14<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>0 \u0e2b\u0e23\u0e37\u0e2d 1<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">8 bit = 1 byte<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e15\u0e31\u0e27\u0e2d\u0e22\u0e48\u0e32\u0e07\u0e40\u0e25\u0e02\u0e10\u0e32\u0e19\u0e2a\u0e2d\u0e07<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>00000001 = 1<br>00001010 = 10<br>11111111 = 255<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e17\u0e33\u0e44\u0e21 PLC \u0e0a\u0e2d\u0e1a\u0e1e\u0e39\u0e14\u0e40\u0e23\u0e37\u0e48\u0e2d\u0e07 byte\/register?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e40\u0e1e\u0e23\u0e32\u0e30\u0e02\u0e49\u0e2d\u0e21\u0e39\u0e25\u0e16\u0e39\u0e01\u0e40\u0e01\u0e47\u0e1a\u0e40\u0e1b\u0e47\u0e19\u0e01\u0e25\u0e38\u0e48\u0e21<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e40\u0e0a\u0e48\u0e19<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Temperature = 523<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e2d\u0e32\u0e08\u0e16\u0e39\u0e01\u0e40\u0e01\u0e47\u0e1a\u0e40\u0e1b\u0e47\u0e19<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>00000010 00001011<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">(16-bit integer)<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">3. Serial vs Parallel<\/h1>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"480\" src=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-3-1024x480.png\" alt=\"\" class=\"wp-image-704\" style=\"width:897px;height:auto\" srcset=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-3-1024x480.png 1024w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-3-300x141.png 300w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-3-768x360.png 768w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-3.png 1280w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\"><a href=\"https:\/\/newhavendisplay.com\/blog\/serial-vs-parallel-communication\/\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/newhavendisplay.com\/blog\/serial-vs-parallel-communication\/<\/a><\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Parallel communication<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e2a\u0e48\u0e07\u0e2b\u0e25\u0e32\u0e22\u0e1a\u0e34\u0e15\u0e1e\u0e23\u0e49\u0e2d\u0e21\u0e01\u0e31\u0e19<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e40\u0e0a\u0e48\u0e19<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>10101100<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e2a\u0e48\u0e07\u0e17\u0e35\u0e40\u0e14\u0e35\u0e22\u0e27 8 \u0e40\u0e2a\u0e49\u0e19<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e02\u0e49\u0e2d\u0e14\u0e35<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u0e40\u0e23\u0e47\u0e27<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e02\u0e49\u0e2d\u0e40\u0e2a\u0e35\u0e22<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u0e2a\u0e32\u0e22\u0e40\u0e22\u0e2d\u0e30<\/li>\n\n\n\n<li>\u0e44\u0e01\u0e25\u0e44\u0e21\u0e48\u0e14\u0e35<\/li>\n\n\n\n<li>noise \u0e07\u0e48\u0e32\u0e22<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e08\u0e36\u0e07\u0e44\u0e21\u0e48\u0e04\u0e48\u0e2d\u0e22\u0e19\u0e34\u0e22\u0e21\u0e43\u0e19\u0e42\u0e23\u0e07\u0e07\u0e32\u0e19\u0e2a\u0e21\u0e31\u0e22\u0e43\u0e2b\u0e21\u0e48<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Serial communication<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e2a\u0e48\u0e07\u0e17\u0e35\u0e25\u0e30\u0e1a\u0e34\u0e15<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>1 \u2192 0 \u2192 1 \u2192 0 \u2192 1<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e43\u0e0a\u0e49\u0e2a\u0e32\u0e22\u0e44\u0e21\u0e48\u0e01\u0e35\u0e48\u0e40\u0e2a\u0e49\u0e19<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e19\u0e34\u0e22\u0e21\u0e21\u0e32\u0e01<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e40\u0e0a\u0e48\u0e19<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<ul class=\"wp-block-list\">\n<li>Modbus RTU<\/li>\n\n\n\n<li>Ethernet<\/li>\n\n\n\n<li>USB<\/li>\n\n\n\n<li>RS232<\/li>\n\n\n\n<li>RS485<\/li>\n<\/ul>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">4. \u0e2a\u0e34\u0e48\u0e07\u0e17\u0e35\u0e48\u0e15\u0e49\u0e2d\u0e07\u0e40\u0e02\u0e49\u0e32\u0e43\u0e08\u0e01\u0e48\u0e2d\u0e19\u0e04\u0e38\u0e22\u0e01\u0e31\u0e19\u0e44\u0e14\u0e49<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e21\u0e35 4 \u0e40\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e2b\u0e25\u0e31\u0e01<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">(1) Physical layer<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u201c\u0e2a\u0e48\u0e07\u0e1c\u0e48\u0e32\u0e19\u0e2d\u0e30\u0e44\u0e23 \u0e43\u0e0a\u0e49\u0e2a\u0e32\u0e22\u0e2d\u0e30\u0e44\u0e23 Hardware \u0e41\u0e1a\u0e1a\u0e44\u0e2b\u0e19&#8221;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e15\u0e31\u0e27\u0e2d\u0e22\u0e48\u0e32\u0e07<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>RS232<\/li>\n\n\n\n<li>RS485<\/li>\n\n\n\n<li>Ethernet<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e40\u0e1b\u0e23\u0e35\u0e22\u0e1a\u0e40\u0e2b\u0e21\u0e37\u0e2d\u0e19 \u201c\u0e0a\u0e19\u0e34\u0e14\u0e2a\u0e32\u0e22\u201d<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"350\" height=\"238\" src=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-4.png\" alt=\"\" class=\"wp-image-705\" srcset=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-4.png 350w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-4-300x204.png 300w\" sizes=\"auto, (max-width: 350px) 100vw, 350px\" \/><figcaption class=\"wp-element-caption\"><a href=\"https:\/\/blog.mbedded.ninja\/electronics\/communication-protocols\/rs-232-protocol\/\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/blog.mbedded.ninja\/electronics\/communication-protocols\/rs-232-protocol\/<\/a><\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">RS232<\/h3>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1025\" height=\"480\" src=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-10.png\" alt=\"\" class=\"wp-image-711\" style=\"width:631px;height:auto\" srcset=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-10.png 1025w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-10-300x140.png 300w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-10-768x360.png 768w\" sizes=\"auto, (max-width: 1025px) 100vw, 1025px\" \/><figcaption class=\"wp-element-caption\"><a href=\"https:\/\/newhavendisplay.com\/blog\/rs232\/\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/newhavendisplay.com\/blog\/rs232\/<\/a><\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e2a\u0e31\u0e49\u0e19 \u0e43\u0e01\u0e25\u0e49 \u0e08\u0e38\u0e14\u0e15\u0e48\u0e2d\u0e08\u0e38\u0e14<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e40\u0e0a\u0e48\u0e19<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">PLC \u2194 \u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e0a\u0e31\u0e48\u0e07<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">RS485<\/h3>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"461\" src=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-11-1024x461.png\" alt=\"\" class=\"wp-image-712\" style=\"width:623px;height:auto\" srcset=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-11-1024x461.png 1024w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-11-300x135.png 300w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-11-768x346.png 768w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-11.png 1152w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\"><a href=\"https:\/\/www.eurotherm.com\/us\/communications-protocols-articles-us\/serial-digital-communications-overview\/\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/www.eurotherm.com\/us\/communications-protocols-articles-us\/serial-digital-communications-overview\/<\/a><\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e44\u0e01\u0e25\u0e01\u0e27\u0e48\u0e32 noise \u0e17\u0e19\u0e01\u0e27\u0e48\u0e32<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e2b\u0e25\u0e32\u0e22\u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e15\u0e48\u0e2d bus \u0e40\u0e14\u0e35\u0e22\u0e27\u0e44\u0e14\u0e49<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e42\u0e23\u0e07\u0e07\u0e32\u0e19\u0e19\u0e34\u0e22\u0e21\u0e21\u0e32\u0e01<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Ethernet<\/h3>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"960\" height=\"540\" src=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-12.png\" alt=\"\" class=\"wp-image-713\" style=\"width:864px;height:auto\" srcset=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-12.png 960w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-12-300x169.png 300w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-12-768x432.png 768w\" sizes=\"auto, (max-width: 960px) 100vw, 960px\" \/><figcaption class=\"wp-element-caption\"><a href=\"https:\/\/www.eufy.com\/blogs\/security-camera\/cat-5-wiring\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/www.eufy.com\/blogs\/security-camera\/cat-5-wiring<\/a><\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">network \u0e41\u0e1a\u0e1a LAN<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e40\u0e0a\u0e48\u0e19<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>PLC \u2192 Switch \u2192 HMI \u2192 SCADA<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">(2) Protocol<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"698\" height=\"345\" src=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-5.png\" alt=\"\" class=\"wp-image-706\" style=\"width:523px;height:auto\" srcset=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-5.png 698w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-5-300x148.png 300w\" sizes=\"auto, (max-width: 698px) 100vw, 698px\" \/><figcaption class=\"wp-element-caption\"><a href=\"https:\/\/instrumentationblog.com\/communication-protocols\/\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/instrumentationblog.com\/communication-protocols\/<\/a><\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u201c\u0e20\u0e32\u0e29\u0e32\u201d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e16\u0e36\u0e07\u0e2a\u0e32\u0e22\u0e40\u0e2b\u0e21\u0e37\u0e2d\u0e19\u0e01\u0e31\u0e19 \u0e41\u0e15\u0e48\u0e1e\u0e39\u0e14\u0e04\u0e19\u0e25\u0e30\u0e20\u0e32\u0e29\u0e32 \u0e01\u0e47\u0e44\u0e21\u0e48\u0e40\u0e02\u0e49\u0e32\u0e43\u0e08<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e15\u0e31\u0e27\u0e2d\u0e22\u0e48\u0e32\u0e07<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">RS485 \u0e40\u0e1b\u0e47\u0e19\u0e41\u0e04\u0e48\u0e2a\u0e32\u0e22<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e1a\u0e19\u0e2a\u0e32\u0e22\u0e2d\u0e32\u0e08\u0e43\u0e0a\u0e49<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Modbus RTU<\/li>\n\n\n\n<li>ASCII<\/li>\n\n\n\n<li>proprietary protocol<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e40\u0e2b\u0e21\u0e37\u0e2d\u0e19\u0e43\u0e0a\u0e49\u0e2a\u0e32\u0e22\u0e42\u0e17\u0e23\u0e28\u0e31\u0e1e\u0e17\u0e4c\u0e40\u0e14\u0e35\u0e22\u0e27\u0e01\u0e31\u0e19 \u0e41\u0e15\u0e48\u0e04\u0e19\u0e2b\u0e19\u0e36\u0e48\u0e07\u0e1e\u0e39\u0e14\u0e44\u0e17\u0e22 \u0e2d\u0e35\u0e01\u0e04\u0e19\u0e1e\u0e39\u0e14\u0e08\u0e35\u0e19<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">(3) Baud rate<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1025\" height=\"480\" src=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-6.png\" alt=\"\" class=\"wp-image-707\" style=\"aspect-ratio:2.135460036357239;width:766px;height:auto\" srcset=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-6.png 1025w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-6-300x140.png 300w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-6-768x360.png 768w\" sizes=\"auto, (max-width: 1025px) 100vw, 1025px\" \/><figcaption class=\"wp-element-caption\"><a href=\"https:\/\/newhavendisplay.com\/blog\/baud-rate\/\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/newhavendisplay.com\/blog\/baud-rate\/<\/a><\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e04\u0e27\u0e32\u0e21\u0e40\u0e23\u0e47\u0e27\u0e2a\u0e48\u0e07\u0e02\u0e49\u0e2d\u0e21\u0e39\u0e25<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e40\u0e0a\u0e48\u0e19<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>9600<br>19200<br>115200<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e2b\u0e21\u0e32\u0e22\u0e16\u0e36\u0e07 bit\/s \u0e42\u0e14\u0e22\u0e1b\u0e23\u0e30\u0e21\u0e32\u0e13<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e16\u0e49\u0e32\u0e15\u0e31\u0e49\u0e07\u0e44\u0e21\u0e48\u0e15\u0e23\u0e07\u0e01\u0e31\u0e19 \u2192 \u0e04\u0e38\u0e22\u0e44\u0e21\u0e48\u0e44\u0e14\u0e49<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e40\u0e0a\u0e48\u0e19<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">PLC:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>9600<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>19200<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e1c\u0e25:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e02\u0e49\u0e2d\u0e21\u0e39\u0e25\u0e21\u0e31\u0e48\u0e27<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">(4) Frame format<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e23\u0e39\u0e1b\u0e41\u0e1a\u0e1a\u0e02\u0e49\u0e2d\u0e21\u0e39\u0e25<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e40\u0e0a\u0e48\u0e19<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>9600,8,N,1<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e41\u0e1b\u0e25\u0e27\u0e48\u0e32<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>9600 baud<\/li>\n\n\n\n<li>8 data bits<\/li>\n\n\n\n<li>N = no parity<\/li>\n\n\n\n<li>1 stop bit<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e16\u0e49\u0e32\u0e44\u0e21\u0e48\u0e15\u0e23\u0e07 \u2192 \u0e2d\u0e48\u0e32\u0e19\u0e44\u0e21\u0e48\u0e2d\u0e2d\u0e01<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">5. \u0e01\u0e32\u0e23\u0e2a\u0e48\u0e07 serial \u0e41\u0e1a\u0e1a\u0e07\u0e48\u0e32\u0e22\u0e2a\u0e38\u0e14<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e2a\u0e48\u0e07\u0e04\u0e33\u0e27\u0e48\u0e32 A<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e02\u0e49\u0e2d\u0e21\u0e39\u0e25\u0e08\u0e23\u0e34\u0e07:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code><strong>01000001<\/strong><\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e41\u0e15\u0e48\u0e40\u0e27\u0e25\u0e32\u0e2a\u0e48\u0e07\u0e08\u0e23\u0e34\u0e07\u0e08\u0e30\u0e16\u0e39\u0e01\u0e2b\u0e48\u0e2d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e40\u0e0a\u0e48\u0e19<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Start bit\n<strong>01000001<\/strong>\nStop bit<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e1b\u0e23\u0e30\u0e21\u0e32\u0e13\u0e19\u0e35\u0e49<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>0 <strong>01000001<\/strong> 1<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e40\u0e1e\u0e37\u0e48\u0e2d\u0e43\u0e2b\u0e49\u0e2d\u0e35\u0e01\u0e1d\u0e31\u0e48\u0e07\u0e23\u0e39\u0e49\u0e27\u0e48\u0e32<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u201c\u0e40\u0e23\u0e34\u0e48\u0e21\u0e41\u0e25\u0e49\u0e27\u0e19\u0e30\u201d \u0e41\u0e25\u0e30 \u201c\u0e08\u0e1a\u0e41\u0e25\u0e49\u0e27\u201d<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">6. Asynchronous vs Synchronous<\/h1>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"543\" src=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-8-1024x543.png\" alt=\"\" class=\"wp-image-709\" style=\"width:758px;height:auto\" srcset=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-8-1024x543.png 1024w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-8-300x159.png 300w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-8-768x407.png 768w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-8.png 1210w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\"><a href=\"https:\/\/www.hackatronic.com\/difference-between-synchronous-and-asynchronous-data-transmission\/\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/www.hackatronic.com\/difference-between-synchronous-and-asynchronous-data-transmission\/<\/a><\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Asynchronous<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e44\u0e21\u0e48\u0e43\u0e0a\u0e49 clock \u0e01\u0e25\u0e32\u0e07<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e43\u0e0a\u0e49 start\/stop bit<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e40\u0e0a\u0e48\u0e19<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>RS232<\/li>\n\n\n\n<li>RS485 Modbus RTU<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e19\u0e34\u0e22\u0e21\u0e21\u0e32\u0e01\u0e43\u0e19\u0e42\u0e23\u0e07\u0e07\u0e32\u0e19<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Synchronous<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e21\u0e35 clock sync<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e40\u0e23\u0e47\u0e27\u0e01\u0e27\u0e48\u0e32<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e40\u0e0a\u0e48\u0e19<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>SPI<\/li>\n\n\n\n<li>Ethernet (\u0e1a\u0e32\u0e07\u0e23\u0e30\u0e14\u0e31\u0e1a)<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">7. Master \/ Slave<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e43\u0e19\u0e42\u0e23\u0e07\u0e07\u0e32\u0e19\u0e40\u0e08\u0e2d\u0e1a\u0e48\u0e2d\u0e22<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e15\u0e31\u0e27\u0e2d\u0e22\u0e48\u0e32\u0e07:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">PLC \u0e2d\u0e48\u0e32\u0e19 inverter<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">PLC = master<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">inverter = slave<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">PLC \u0e16\u0e32\u0e21:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u0e04\u0e27\u0e32\u0e21\u0e40\u0e23\u0e47\u0e27\u0e15\u0e2d\u0e19\u0e19\u0e35\u0e49\u0e40\u0e17\u0e48\u0e32\u0e44\u0e23<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">inverter \u0e15\u0e2d\u0e1a:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>1450 RPM<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e40\u0e0a\u0e48\u0e19\u0e43\u0e19 Modbus<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">PLC \u0e2a\u0e48\u0e07 request<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u0e2d\u0e48\u0e32\u0e19 register 40001<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">slave \u0e15\u0e2d\u0e1a\u0e01\u0e25\u0e31\u0e1a<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">8. Address<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e40\u0e27\u0e25\u0e32\u0e21\u0e35\u0e2b\u0e25\u0e32\u0e22\u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e1a\u0e19 RS485<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e15\u0e49\u0e2d\u0e07\u0e21\u0e35\u0e1a\u0e49\u0e32\u0e19\u0e40\u0e25\u0e02\u0e17\u0e35\u0e48<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e40\u0e0a\u0e48\u0e19<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Drive1 = 1<br>Drive2 = 2<br>Drive3 = 3<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">PLC \u0e16\u0e32\u0e21:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>device 2<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e2d\u0e37\u0e48\u0e19\u0e40\u0e07\u0e35\u0e22\u0e1a<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">9. Error detection (CRC)<\/h1>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"1024\" src=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-9.png\" alt=\"\" class=\"wp-image-710\" style=\"width:656px;height:auto\" srcset=\"https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-9.png 1024w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-9-300x300.png 300w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-9-150x150.png 150w, https:\/\/www.299engineering.co.th\/wp-content\/uploads\/2026\/06\/image-9-768x768.png 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\"><a href=\"https:\/\/www.firgelliauto.com\/es\/blogs\/engineering-calculators\/crc-16-crc-32-checksum-generator-modbus?srsltid=AfmBOoqYr3Js60Pa84ZYl2qMB3wWi6t4ujxvrvCUDbndY4EWTNA3i7-B\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/www.firgelliauto.com\/es\/blogs\/engineering-calculators\/crc-16-crc-32-checksum-generator-modbus?srsltid=AfmBOoqYr3Js60Pa84ZYl2qMB3wWi6t4ujxvrvCUDbndY4EWTNA3i7-B<\/a><\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e02\u0e49\u0e2d\u0e21\u0e39\u0e25\u0e23\u0e30\u0e2b\u0e27\u0e48\u0e32\u0e07\u0e17\u0e32\u0e07\u0e2d\u0e32\u0e08\u0e40\u0e1e\u0e35\u0e49\u0e22\u0e19<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e08\u0e36\u0e07\u0e21\u0e35 checksum\/CRC<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e40\u0e0a\u0e47\u0e04\u0e27\u0e48\u0e32<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u0e02\u0e49\u0e2d\u0e21\u0e39\u0e25\u0e40\u0e2a\u0e35\u0e22\u0e44\u0e2b\u0e21<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e16\u0e49\u0e32\u0e40\u0e2a\u0e35\u0e22<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ignore<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e2b\u0e23\u0e37\u0e2d request \u0e43\u0e2b\u0e21\u0e48<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">10. \u0e25\u0e33\u0e14\u0e31\u0e1a\u0e01\u0e32\u0e23\u0e04\u0e34\u0e14\u0e40\u0e27\u0e25\u0e32 debug \u0e2b\u0e19\u0e49\u0e32\u0e07\u0e32\u0e19<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e16\u0e49\u0e32\u0e04\u0e38\u0e22\u0e44\u0e21\u0e48\u0e44\u0e14\u0e49 \u0e2d\u0e22\u0e48\u0e32\u0e40\u0e14\u0e32\u0e2a\u0e38\u0e48\u0e21<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e40\u0e0a\u0e47\u0e04\u0e15\u0e32\u0e21\u0e19\u0e35\u0e49:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u0e2a\u0e32\u0e22\u0e16\u0e39\u0e01\u0e44\u0e2b\u0e21<\/li>\n\n\n\n<li>Physical layer \u0e16\u0e39\u0e01\u0e44\u0e2b\u0e21 (RS232\/485) \u0e15\u0e48\u0e2d\u0e02\u0e32\u0e16\u0e39\u0e01\u0e44\u0e2b\u0e21<\/li>\n\n\n\n<li>TX\/RX \u0e16\u0e39\u0e01\u0e44\u0e2b\u0e21 (\u0e15\u0e49\u0e2d\u0e07\u0e2a\u0e25\u0e31\u0e1a\u0e01\u0e31\u0e19)<\/li>\n\n\n\n<li>baud rate \u0e15\u0e23\u0e07\u0e44\u0e2b\u0e21<\/li>\n\n\n\n<li>parity \u0e15\u0e23\u0e07\u0e44\u0e2b\u0e21<\/li>\n\n\n\n<li>address \u0e16\u0e39\u0e01\u0e44\u0e2b\u0e21<\/li>\n\n\n\n<li>protocol \u0e15\u0e23\u0e07\u0e44\u0e2b\u0e21<\/li>\n\n\n\n<li>register \u0e16\u0e39\u0e01\u0e44\u0e2b\u0e21<\/li>\n\n\n\n<li>termination\/bias resistor \u0e16\u0e39\u0e01\u0e44\u0e2b\u0e21<\/li>\n\n\n\n<li>\u0e21\u0e35 CRC error \u0e44\u0e2b\u0e21<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e41\u0e1c\u0e19\u0e17\u0e35\u0e48\u0e04\u0e27\u0e32\u0e21\u0e23\u0e39\u0e49\u0e41\u0e1a\u0e1a\u0e22\u0e48\u0e2d:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code><strong>Digital Communication<\/strong>\n\u2502\n\u251c\u2500 Bit \/ Byte\n\u251c\u2500 Serial vs Parallel\n\u251c\u2500 Physical Layer\n\u2502    \u251c\u2500 RS232 (3 \u0e2a\u0e32\u0e22 TX,RX,GND)\n\u2502    \u251c\u2500 RS485 (2 \u0e2a\u0e32\u0e22 A,B)\n\u2502    \u2514\u2500 Ethernet \n\u2502\n\u251c\u2500 Protocol\n\u2502    \u251c\u2500 Modbus RTU\n\u2502    \u251c\u2500 Modbus TCP\n\u2502    \u2514\u2500 ASCII\n\u2502\n\u251c\u2500 Communication Setting\n\u2502    \u251c\u2500 Baud rate\n\u2502    \u251c\u2500 Data bit\n\u2502    \u251c\u2500 Parity\n\u2502    \u2514\u2500 Stop bit\n\u2502\n\u251c\u2500 Address\n\u251c\u2500 CRC\n\u2514\u2500 Debug<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0e16\u0e49\u0e32\u0e08\u0e30\u0e40\u0e23\u0e35\u0e22\u0e19\u0e43\u0e2b\u0e49 \u201c\u0e43\u0e0a\u0e49\u0e07\u0e32\u0e19 PLC \u0e08\u0e23\u0e34\u0e07\u0e44\u0e14\u0e49\u201d \u0e02\u0e31\u0e49\u0e19\u0e15\u0e48\u0e2d\u0e44\u0e1b\u0e04\u0e27\u0e23\u0e40\u0e23\u0e35\u0e22\u0e19: <strong>RS232\/RS485 \u2192 ASCII \u2192 Modbus RTU \u2192 Modbus TCP \u2192 Ethernet\/IP \u0e2b\u0e23\u0e37\u0e2d Profinet<\/strong> \u0e01\u0e48\u0e2d\u0e19 \u0e40\u0e1e\u0e23\u0e32\u0e30\u0e43\u0e0a\u0e49\u0e43\u0e19\u0e42\u0e23\u0e07\u0e07\u0e32\u0e19\u0e08\u0e23\u0e34\u0e07\u0e21\u0e32\u0e01\u0e17\u0e35\u0e48\u0e2a\u0e38\u0e14 \u0e42\u0e14\u0e22\u0e40\u0e09\u0e1e\u0e32\u0e30\u0e07\u0e32\u0e19 PLC\/\u0e15\u0e39\u0e49\u0e04\u0e2d\u0e19\u0e42\u0e17\u0e23\u0e25<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u0e2b\u0e25\u0e32\u0e22\u0e04\u0e19\u0e0a\u0e2d\u0e1a\u0e21\u0e35\u0e1b\u0e31\u0e0d\u0e2b\u0e32\u0e01\u0e31\u0e1a\u0e40\u0e08\u0e49\u0e32\u0e2a\u0e32\u0e22 RS-232 \/ RS-232C \/ RS-422 \/ RS-485 \u0e41\u0e25\u0e30\u0e2a\u0e31\u0e1a\u0e2a\u0e19\u0e01\u0e31\u0e1a MODBUS RTU\/TCP CC-LINK MC-Protocol &#8230;<br \/>\n\u0e27\u0e31\u0e19\u0e19\u0e35\u0e49\u0e08\u0e30\u0e40\u0e2d\u0e32\u0e43\u0e2b\u0e49\u0e2b\u0e32\u0e22\u0e07\u0e07 \u0e2b\u0e32\u0e22\u0e2a\u0e07\u0e2a\u0e31\u0e22 \u0e44\u0e14\u0e49\u0e01\u0e23\u0e30\u0e08\u0e48\u0e32\u0e07\u0e41\u0e08\u0e49\u0e07 \u0e43\u0e19\u0e2a\u0e34\u0e48\u0e07\u0e17\u0e35\u0e48\u0e04\u0e32\u0e2b\u0e31\u0e27\u0e21\u0e32\u0e19\u0e32\u0e19<\/p>\n","protected":false},"author":2,"featured_media":697,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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