CONTREX M-Traverse - Manual (Page 121)

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Characters 5,6 - Parameter Number:
These characters will always be “0”.
Characters 7 through 12 - DATA:
These characters will always be “0”.
Characters 13,14 - DATA:
The command function of the message that was received, is returned.
Character 15 - Data Format:
This character will always be “0”.
Character 16 - ETX:
The return message is always terminated with the ASCII “ETX” character.