How to send CLI commands through serial connection in a WR21?

I’m trying to send CLI commands from a PLC to a Digi Transport WR21 in order to have it send an SMS to the number specified in the command and with the text also specified in the command. Ex: sendSMS (telephone nº) “text to send”
Is this achievable?
Thank you in advance.

if you have the correct cable connected between the router and PLC you should be able to just send the string as

sendsms phonenumber “message”

the phone number might have to be the intenational number with out the leading “0”'s

to test from the web interface you can use the same command in the “execute command” section

to check what is being passed over the serial interface you can use the analyser if you enable it it should be already configured for asy0 and you should be able to see an the trace section what is being passed to the router