User's Manual

WaveCom Electronics Inc

MA4061/MA4070 Manual; MAN1L2301 Rev02 (Oct 2001)

Approved: R. L.

7.4 Response Structure

The response structure will consist of a sequence of ASCII characters, terminated by a carriage return.

Responses will be in one of the two following general formats:

There will be one response returned for all commands.

<start> ASCII Asterisk character

<sp> ASCII Space character

<cr> ASCII Carriage Return character

ADD

= Address (3 characters)

The address of the unit that is responding to the command.

R = ASCII “R” character (1 character)

Indicates that this is a response to a previous message.

= Response Code (3 characters)

OK = Command Accepted

MOD = Command Denied because the addressed module is invalid

ERR = Command Denied because of Syntax Error

CRC = Command Denied because of CRC-16 error

CRC = CRC-16 checksum (3 characters)

The response checksum is always valid. The first character will be an ASCII “V” followed by the low and

high bytes respectively of the computed CRC 16 checksum (the checksum characters are not necessarily

ASCII). The checksum will be computed on all characters after the initial <start> character up to, and

including, the first “V” character in the CRC section.

PARM

is one or more characters, and is command specific.