I’m trying to dial a number on GL7812 but the ATD command doesn’t work. It returns an ERROR with a CME error code of 4 - Operation not supported.
The modem is registered and RSSI is quite good. I’m not sure what else to do about it.
AT+CPIN?
+CPIN: READY
OK
AT+CREG?
+CREG: 0,1
OK
AT+CEREG?
+CEREG: 0,1
OK
AT+CSQ
+CSQ: 31,99
OK
ATD?
+CME ERROR: 4
Firmware version: GL7812.5.5.8.0-23.10.0.FreeRTOS.w41
Long revision identification: HL78xx.5.5.8.0.RK_03_02_00_00_34211_001.20231031
What do you want to do with ATD?
Ppp dial up?
For CSD (Circuit Switched Data) transmission.
Does your cat-m network or nbiot network support CSD?
Or you are using GSM network?
I’m using a GSM network. The operator is supporting CSD.
The issue is that the command doesn’t work at all. There is no dialing. Even ATD? returns the error.
how about atd99**1# to dial up?
Actually i don’t see such GSM CSD feature in the specification…
In other products like WP76 or HL8548, if they support CSD, this will be mentioned in the specification