AT+CSQ? returns error

Question

I need help, i am working with Arduino UNO and a GPRS shield, which is powered with an adapter that outputs 12v 500mA. The sim card is placed properly, i checked this with the AT+CPIN? command, but when i try to check the signal level with AT+CSQ?, it just return error. Please can someone help me.

Same problem, was working previously - get the feeling it's possibly a configuration that's missing to enable, same thing happens with `AT+CBC` too, immediate `ERROR` reply. — James, Jan 18 '18 at 21:13

score 5 · Accepted Answer · answered Jan 19 '18 at 11:32

5

AT+CSQ? isn't a valid command, however AT+CSQ is - remove the ?.

answered Jan 19 '18 at 11:32

James

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Ok thanks man. At least I know know the source of the problem. – wokoro douye samuel Jan 20 '18 at 06:36
1

@lilfancy no worries, worth checking the documentation it probably varies between modules (I’ve verified with a SIM800L model). Also, slightly alarmed by your power supply.... seems far too much voltage & far too little current for a typical GSM module, which one are you using? – James Jan 20 '18 at 10:09
Am using sim800 model – wokoro douye samuel Apr 13 '18 at 15:28

denizkanmaz · Answer 2 · 2021-05-14T18:25:23.577

The command appears to be wrong. Probably these are what you were looking for:

AT+CSQ=?: This command is to request the supported RSSIs (Received Signal Strength Indication) and BERs (Bit Error Rate). You might want to get this information before requesting the current cell signal level.

AT+CSQ: And this command is to request the current cell signal level.

Here is the result from my SIM808 module:

AT+CSQ=?
+CSQ: (0-31,99),(0-7,99)
OK

AT+CSQ
+CSQ: 25,0
OK

So that means:

0-31,99: Supported RSSIs

0-7,99: Supported BERs

25,0: Currently, the RSSI value is 25 and the BER value is 0

Please refer here for further details.

AT+CSQ? returns error

2 Answers2