Hello,
Could you provide more details on what exactly does not work with AT+CPIN? command?
I have tried the following setup and had it working:
RS485 settings:
For communication, I used PuTTy serial client, with the following setup:
The primary window keeps showing output of AT+QCSQ command. To disable this, execute the command:
Since you might not be able to see what is veing entered to the terminal, you need to enter the following command to enable local echo:
Then execute AT+CPIN?
If you have issues with RS485 communication itself, check if your connector is correctly wired. For reference, check this thread and this wiki article.
Best regards,