WMOD2 GSM modem with V120

[tss]

I am trying to get a V120 to send an SMS message using a Wavecom WMOD2 modem but the port is never properly initialised. The error code is 2 (reply error). I have verified that the modem itself is working by sending SMS messages using Hyperterminal.

One thing that might be an issue is that there is no built-in configuration for this modem, so I had to make my own which may not be correct. Does anyone have experience using this modem? If so, which commands did you use to initialise it?

Should the PLC-side modem configuration just be the same as the port initialisation?

Thanks in advance.

[Simon]

Is this quite an old modem? I googled it and found a datasheet. It looks like the predecessor to the Wavecom Fastrack family.

Have you tried any of the Wavecom profiles that Unitronics do support? I would start with the Fastrack M1206/1306 profile.

Another handy tool is the COM sniffer, see link below:

http://www.unitronics.com/Data/Uploads/Miscellaneous/Communications%20Sniffer.pdf

This will show you where the communication sequence fails.

If you keep hitting brick walls I would go looking for one of the modems that is on the supported list.

[tss]

Thanks. Ultimately I just decided to send the AT commands using protocol send blocks which works well. Will need to get a more modern modem next time.

[Simon]

I think your solution is a good one. Even though you lose some of the nice automation features of the built-in SMS, at least you have full control of the situation.