AT commands from PLC

Hi everyone.
Can anyone help me on how to send AT commands through my Omron PLC?
What I have is a GSM modem connected to the built-in RS232 port of my CPU.
Or if you have documentation or an online source, please do refer, I could just read I would be fine with that.
Please help me.

welcome to the site
you need to specify which Omron PLC
there is a direct TX and Direct RX command in the CJ series

Hi Ian!

Thank you for the response
I'm using CJ1M.
I've kinda figured out already that I'll be using TXD and RXD commands.
But what I was still confused about is how to input the commands in the PLC data memory.

For example for the sending command:

at+cmgs= "639161234567"<CR>TEST.<CtrlZ>

should I be converting each character (whether letter or number ) to its HEX equivalent?


I've read the manual for TXD and RXD instructions. I didn't understand how "@GL" would become 40534E.
40 would be for the @ sign but I'm not sure about the rest.

Thank you again for helping me out. All these stuffs are pretty new to me. I don't want to waste more time learning everything on my own. I have to ask help sometimes.

Give me a while and I will post some stuff for you. Have not done it for a while but think I have all the documentation here.

Yes!

I have figured it out.

There's a hex equivalent for each character. Just convert each one. But take note that TXD utilizes a certain pattern; you could have MOST SIGNIFICANT BYTE FIRST or LEAST SIGNIFICANT BYTE FIRST.

For those who would also like to know. Please view attachment.

But I appreciate your help Ian and Bob!

thanks much!

AT Commands from PLC

Hi, im using siemens S7-1200 and I have enfora GSM module, please help me how to send AT commands. Thanks

Dear Eemann,



Welcome to the forum. I would recommend posting a new thread, this one is 7 years old and is for a different PLC altogether.


You might also want to specify what PLC and CP/CM you have, as well as your GSM module.