Posted 21 Jul 2015 Hello, I am not familiar with the Omron PLC's. A PC is connected to the peripheral port of an CJ1M CPU12 PLC. The write command the PC is transmitting to the PLC looks like this (ASCII): "@00WD0070010055*." Can you tell me what kind of communication protocol it is using? It is a public or proprietary protocol? Thank you! Share this post Link to post Share on other sites
Posted 21 Jul 2015 Hello, That is an OMRON Host link (C-mode) command, DM Area Write. Manual W342-07 covers the protocol. Share this post Link to post Share on other sites
Posted 22 Jul 2015 Thank you! I've found this version: W342-E1-15. Share this post Link to post Share on other sites