Is it possible using the DTMF functionality on a PCD which is equipped with a GSM modem?

FAQ #100120

 

Can a GSM modem (terminal) receive DTMF tones?
It's not possible to receive DTMF tones with a GSM modem (mounted on a PCD). This is due to the fact that the GSM standard doesn't support the reception of DTMF tones on a GSM modem.

 

Can I still have a similar functionality when I use a GSM terminal?
If you want to have the DTMF funcionaltiy (set binary/numeric values on the PCD or know the status of binary/numeric values of the PCD) on a PCD equipped with GSM modem then you can take advantage of the SMS service:
You can send a SMS message containing DTMF commands to the PCD (in the same way as you would use the phone keys for the DTMF). The PCD then can respond with a SMS to e.g. the originator of the command (for the acknowledgement of the command).

How can I realize that?
On the PCD you have use the FBox "PollSMS" to receive the SMS and the FBox "DTMF Driver" and "DTMF user xy" to handle the text on the received SMS. For further information please refer to the example available in the "Getting started" area of the support site www.sbc-support.ch and to the online help of the relevant FBoxes.