Gap Response Message Fields

The Gap Response message is sent by the GRP in response to a Gap Request message. The Unit and Sequence fields will match the values supplied in the Gap Request message. A Gap Response message, with a Status of Accepted or reason for failure, will be sent for each Gap Request message received by the GRP.

Table 1. Gap Response
Field	Offset	Length	Value/Type	Description
Length	0	1	Binary	Length of this message including this field
Message Type	1	1	0x04	Gap Response message
Unit	2	1	Binary	Unit the gap was requested for
Sequence	3	4	Binary	Sequence of first message in request
Count	7	2	Binary	Count of messages requested
Status	9	1	Alphanumeric	Accepted or reason for reject. All non-'A' status codes should be interpreted as a reject. A = Accepted O = Out of range (ahead of sequence or too far behind) D = Daily gap request allocation exhausted M = Minute gap request allocation exhausted S = Second gap request allocation exhausted C = Count request limit for one gap request exceeded I = Invalid Unit specified in request U = Unit is currently unavailable
Total Length = 10 bytes

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Gap Response Message Fields