Testing a Modem - Sample Project: ModemDiagnostics.ptp

The Docklight project ModemDiagnostics.ptp can be used to perform a modem check. A set of modem diagnostic commands are defined in the Send Sequences list.

This is a simple example for Testing a serial device or a protocol implementation. The sample project uses the communication settings listed below. This should work for most standard modems.

Communication Mode	Send/Receive
COM Port Settings	9600 Baud, No parity, 8 Data Bits, 1 Stop Bit

Getting started

•	Connect the modem to an available COM port, e.g. COM1, and switch it on. The demo may also run on a notebook with a built-in modem. In many cases you will find your notebook's built-in modem on COM3, so you can try and run the demo without modifying the project settings.

•	Go to the Project Settings... dialog and make sure you have selected the same COM Port for Send/Receive on comm. channel.

•	Press the Start Communication button in the toolbar.

•	Try sending any of the predefined modem commands by pressing the Send button

You should now receive a response from your modem, e.g. "OK" if your command was accepted, a model identification number, etc. The response will vary with the modem model.

After sending several sequences, the Docklight communication window could look like this:

3/8/2009 15:00:44.034 [TX] - ATQ0V1E0<CR><LF>

3/8/2009 15:00:44.040 [RX] - <CR><LF>

OK<CR><LF>

3/8/2009 15:00:44.608 [TX] - AT+GMM<CR><LF>

3/8/2009 15:00:44.610 [RX] - <CR><LF>

H.324 video-ready rev. 1.0<CR><LF>

OK<CR><LF>

3/8/2009 15:00:45.049 [TX] - AT+FCLASS=?<CR><LF>

3/8/2009 15:00:45.060 [RX] - <CR><LF>

0,1,8<CR><LF>

...

Further Information

The Send Sequences list includes the following standard AT modem commands:

Send Sequence	Description / Modem Response
ATQ0V1E0	Initializes the query.
AT+GMM	Model identification (ITU V.250 recommendation is not supported by all modems).
AT+FCLASS=?	Fax classes supported by the modem, if any.
AT#CLS=?	Shows whether the modem supports the Rockwell voice command set.
ATI<n>	Displays manufacturer's information for <n> = 1 through 7. This provides information such as the port speed, the result of a checksum test, and the model information. Check the manufacturer's documentation for the expected results.

The \Samples folder also contains a log file ModemDiagnostics_Logfile_asc.txt. It shows a test run where the above Send Sequences were sent to a real modem.