Satel ETHM-1 - Manual (Page 16)

SATEL 2014-04-02
INT-RS module returns an answer on every command - function result or 0xEF result (described below), so after sending any
command to the module please wait for answer before sending the next one (or give the module e.g. 3 seconds time-out).
0xEF result + 1 byte - result code:
0x00 - ok
0x01 - requesting user code not found
0x02 - no access
0x03 - selected user does not exist
0x04 - selected user already exists
0x05 - wrong code or code already exists
0x06 - telephone code already exists
0x07 - changed code is the same
0x08 - other error
0x11 - can not arm, but can use force arm
0x12 - can not arm
0x8? - other errors
0xFF - command accepted (i.e. data length and crc ok), will be processed
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