Motorola g20 Developer's Manual page 221

4.11.1.4 +CMER, Set/Request Local Key Press Echo Keypad Mode
This command enables an external accessory to receive key press information from the g20's internal keypad. In some cases,
this is used to track the user activity for redisplay on a vehicle system, or to perform accessory-specific menu operations.
Set Command
The Set command enables or disables the sending of unsolicited result codes from the TA to the terminal in the case of key
pressings, display changes and indicator state changes. If the g20 does not support the setting, +CMER ERROR: <err> is
returned.
Command
AT+CMER=[<mode>[,keypd>
[,<disp> [,<ind>[,<bfr>]]]]]
Read Command
The Read command returns the current event reporting settings.
Command
AT+CMER?
Test Command
The Test command returns a list of the supported event reporting settings.
Command
AT+CMER=?
98-08901C68-O
Response/Action
OK
or:
+CME ERROR: <err>
Response/Action
+CMER: <mode>,<keyp>,<disp>,<ind>,<bfr>
OK
Response/Action
+CMER: (list of supported <mode>s), (list of supported
<keyp>s), (list of supported <disp>s),(list of supported
<ind>s),(list of supported <bfr>s)
OK
AT Commands Reference
207