I am trying to use a RUT976 for a legacy RS232 application among other things. This application will send out a AT+CSQ, (Check Signal Strength), and expects a valid answer before moving on in the code. The main purpose with the application is to send/receive SMS-messages.
Everything seems to be working just fine, except for a couple of commands:
AT+CSQ => ERROR
AT+CREG => ERROR
I have not been able to find a proper AT-command manual for the serial port.
AT+CSQ coomand is a leftover from 2G/3G times, so it’s normal that it’s not supported on 4G/5G device that follows 3GPP release 17. From what I recall, the newer command is AT+QCSQ (although I’m not certain here)
Although I haven’t had any exposure of the RUT976, I think I’m right in saying that the module inside is a Quectel RG255C-GL …. see if this RG255C-GL AT Commands doc helps - look at the Useful Links on the web page referenced.
If it doesn’t, then I saw that Quectel (prior to any documentation release for the RG255C), suggested developers refer to the documents for the RG500Q, but there are some differences between the two modules. This documentation can be found here.
Sometimes Quectel are very late getting out full documentation and even then, it can be like getting blood out of a stone.
Could you please confirm whether your questions regarding the +CSQ command have been answered and clarified? If you still need any further assistance, please let me know so we can move this forward.
If the +CSQ has become obsolete I guess there is nothing much to do?
Without really knowing how things are built up inside the RUT976, the only way to get the +CSQ command to work ought to be if Teltonika implements some layer in between the RS232 and the Quectel RG255C-GL and if it is only me requesting this functionality, this case can be considered closed and “solved”.
In my previous reply, I’ve realised I sent a link to a draft copy of the RG500Q command manual. The latest version I have is 1.2 and can be found here - see the datasheets section and click on Quectel_RG50xQ_RM5xxQ_Series_AT_Commands_Manual_V1.2. Upon opening, you will see that there are many more AT commands listed.
It’s not for your exact modem model, but as Quectel advised early into the product release, in the absence of their official documentation, some insights could be gleaned from the 500q documentation.
