1 | CONNECT | Connection. |
2 | RING | Ringing signal detected. |
3 | NO CARRIER | Carrier lost or never present. |
4 | ERROR | Invalid Command. |
6 | NO DIAL TONE | No dial tone detected. |
7 | BUSY | Busy signal detected. |
8 | NO ANSWER | No answer from remote modem. |
GPRS operation
The three main commands used to set up a GPRS call with the Delta Plus MOBILE II GSM/GPRS modem in listening mode are as follows:
AT+Gn, where n = 0 to 9
AT+G0 - turns off GPRS mode
If AT+Gn is on ( ie n =
AT+CDGCONT = n,”IP”,"Enter access point name (APN) address here"
.
AT*ENAD = n,"GPRS","username","password",1,0
To escape from TCP/IP listening mode when a session is not connected issue a Ctrl C.
This can take several minutes to “detach” from the network and will set AT+G0 until +G is changed or a reset or a power cycle is invoked. This will set the modem back into auto mode.
Firmware version 2.10 and above:
Additional GPRS watchdogs have been added to the modem in order to negate network fail conditions, these ensure that the unit continually
Timeouts:
Typically these are –
Online GPRS inactivity timeout of 4m 16s (256 seconds) - covers failure mid session
User exit from GPRS mode (Ctrl C) times out & GPRS restarts after 1m 42 secs unless the AT+G command is used.
Fail safe timeout restarts every 3h 37.6 minutes if unit is offline. Covers random GPRS network failures!
Lack of Signal/Signal Quality (SQ) timeout is 45 minutes.
ASL Holdings Limited | 19/09/2005 | 16 |
Draft Copy Version 2c |
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