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CDMA modem and GSMAT commands

 
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SysAdminGuy



Joined: 08 Apr 2009
Posts: 2

PostPosted: Wed Apr 08, 2009 3:53 pm    Post subject: CDMA modem and GSMAT commands Reply with quote

I've got a MultiTech MTCBA-C wireless CDMA modem for Verizon. With HyperTerminal, I've been able to successfully send SMS messages using AT commands. When using NotePager Pro, it wants to send AT+CMGF=1; however, the modem doesn't understand this command and returns "ERROR" to which NotePager responds "Unable to enter text delivery mode." The modem can go right to the AT+CMGS command. Is there a way I can change the NotePager Pro settings to bypass the enter text delivery mode command?


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OzCom



Joined: 22 Oct 2003
Posts: 1122
Location: US

PostPosted: Thu Apr 09, 2009 8:45 am    Post subject: Reply with quote

There is not a way to delete that command from Notepager Pro - nor is there a need. The ERROR you are seeing is merely a response to an unsupported command. When NPP issues the command and receives the MultiTech error - it simply moves on. The command does not effect the operation of the modem itself. The problem lies in the way that the Wavecom chipset that is integral to the MultiTech modem implements the AT Command set on it's CDMA devices. If you're interested, use Hyperterminal and issue the "Extended Error Code" command to the CDMA device by entering AT+CMEE=1. After you receive the "OK", issue the AT+CMGF=1 command. Now you will see the modem's error code. the NPP (and PageGate) implementation of the AT command set is as per the GSM specification - the CDMA devices available do not adhere to these standarsa exactly. That being said, we have installed numerous CDMA and GSM devices from MultiTech along with NPP and PageGate - on all cellular networks. There is virtually no degredation in performance found



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SysAdminGuy



Joined: 08 Apr 2009
Posts: 2

PostPosted: Thu Apr 09, 2009 11:56 am    Post subject: Reply with quote

Well, that's just it - NPP isn't moving on after getting the error back from the MultiTech modem. (Please see below.) Is there a setting to adjust?

4/9/2009 12:48:43 PM Dialer Started
4/9/2009 12:49:03 PM ====================================
4/9/2009 12:49:03 PM Start connection to carrier: CDMA_Modem
4/9/2009 12:49:03 PM Connect using GSMAT protocol
4/9/2009 12:49:03 PM Setting communication parameters
4/9/2009 12:49:03 PM Attempting to reset modem
4/9/2009 12:49:06 PM Sent:AT<CR>
4/9/2009 12:49:07 PM Received:<CR><LF>OK<CR><LF>
4/9/2009 12:49:07 PM Modem reset
4/9/2009 12:49:07 PM Sent:AT+CMGF=1<CR>
4/9/2009 12:49:13 PM Received:<CR><LF>ERROR<CR><LF>
4/9/2009 12:49:13 PM Unable to enter text delivery mode
4/9/2009 12:49:13 PM Attempting to hang up modem
4/9/2009 12:49:15 PM Sent:AT<CR>
4/9/2009 12:49:16 PM Received:<CR><LF>OK<CR><LF>
4/9/2009 12:49:16 PM Modem hung up
4/9/2009 12:49:34 PM ====================================
4/9/2009 12:49:34 PM Start connection to carrier: CDMA_Modem
4/9/2009 12:49:34 PM Connect using GSMAT protocol
4/9/2009 12:49:34 PM Setting communication parameters
4/9/2009 12:49:35 PM Attempting to reset modem
4/9/2009 12:49:37 PM Sent:AT<CR>
4/9/2009 12:49:38 PM Received:<CR><LF>OK<CR><LF>
4/9/2009 12:49:38 PM Modem reset
4/9/2009 12:49:38 PM Sent:AT+CMGF=1<CR>
4/9/2009 12:49:44 PM Received:<CR><LF>ERROR<CR><LF>
4/9/2009 12:49:44 PM Unable to enter text delivery mode
4/9/2009 12:49:44 PM Attempting to hang up modem
4/9/2009 12:49:47 PM Sent:AT<CR>
4/9/2009 12:49:47 PM Received:<CR><LF>OK<CR><LF>
4/9/2009 12:49:47 PM Modem hung up
4/9/2009 12:50:05 PM ====================================
4/9/2009 12:50:05 PM Start connection to carrier: CDMA_Modem
4/9/2009 12:50:05 PM Connect using GSMAT protocol
4/9/2009 12:50:05 PM Setting communication parameters
4/9/2009 12:50:06 PM Attempting to reset modem
4/9/2009 12:50:09 PM Sent:AT<CR>
4/9/2009 12:50:09 PM Received:<CR><LF>OK<CR><LF>
4/9/2009 12:50:10 PM Modem reset
4/9/2009 12:50:10 PM Sent:AT+CMGF=1<CR>
4/9/2009 12:50:15 PM Received:<CR><LF>ERROR<CR><LF>
4/9/2009 12:50:15 PM Unable to enter text delivery mode
4/9/2009 12:50:15 PM Attempting to hang up modem
4/9/2009 12:50:18 PM Sent:AT<CR>
4/9/2009 12:50:19 PM Received:<CR><LF>OK<CR><LF>
4/9/2009 12:50:19 PM Modem hung up
4/9/2009 12:50:19 PM Carrier retry limit reached. Marking pending messages as bad
4/9/2009 12:50:19 PM FAILED To:XXXX Frm:XXXXXXXXXX Msg:this is a test, yes, this is a test


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Tech Support



Joined: 25 Aug 2003
Posts: 4387

PostPosted: Thu Apr 09, 2009 12:02 pm    Post subject: Reply with quote

You may want to think about switching to PageGate. PageGate has much fuller and broader support for Cellular Modems than NotePager Pro does and this shouldn't be an issue in PageGate.



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