
Microtronix Access User Guide
Payload length
Payload
MSB
LSB
Application message
11.4 RFC1006
This method guarantees message boundaries in exactly the same way as the MBIT method described
above. Only the message header differs in length and value. The RFC1006 header consists of 4 bytes
consisting of 2 fixed-value bytes (for identity and recognition) followed by the length of the entire
message, payload and header.
RFC1006 message format:
Version
Pad
RFC1006 message length
(4 + payload length)
Payload
0x03
0x00
MSB
LSB
Application message
11.5 Q-MBIT
This method guarantees message boundaries in exactly the same way as the RFC1006 method
described above. The message header differs in the pad byte. The Q-MBIT header has 4 bytes
consisting of a fixed-value byte (for identity and recognition), a Q-bit flag byte coded 0 or 1, followed by
the length of the entire message, payload and header. Q-bit packets are used by some X.25
applications for passing control information..
Q-MBIT message format:
Version
Q-bit
Q-MBIT message length
(4 + payload length)
Payload
0x03
0x00/1
MSB
LSB
Application message
11.6 OFTP
This method guarantees message boundaries in exactly the same way as the MBIT method described
above. Only the message header differs in length and value. The OFTP header consists of 4 bytes
consisting of 1 fixed-value byte (for identity and recognition) followed by a 3-byte length of the entire
message, payload and header.
OFTP message format:
Version
OFTP message length
(4 + payload length)
Payload
0x10
MSB
LSB
Application message
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