Hi,
I'm trying to send SMS using CJ1M and DIGICOM POKET GSM modem via the RS232 port integrated on CP21. I've copied a working program for sending SMS using a CP1L and Siemens MC35i, but now, after sending the AT command using TXD, the Reception Completed Flag (A392.06) doesn't go ON, so I can't know if the message was correctly sent.
The cable i'm using is the same I've used for CP1L and MC35i:

Modem | PLC Omron

Pin 2 -> Pin 3
Pin 3 -> Pin 2
Pin 5 -> Pin 9
| Pin 4 (PLC) - Pin 5 (PLC)

I suppose there is a problem into the cable, but I can't find any configuration schema for it.

Is the Reception Counters value (A393) receiving data?

To be even more simpler, does the modem have have comm activity indications? Does the SMS message actually go through?

Hi, the A393, after sending first TXD command, values 0x001C (28), but the A392.06 flag is always OFF. The modem doesn't have indicators for activity execution. And I can't send SMS.

Now It work fine.

I've changed the STUP config settings, using CR,LF end code.