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Full Duplex Transport Layer Specification Page 4 of 5

the received frame or if the receiving stations receive queue is full, the station should respond with

a NAK flag as NAKs are used for flow control. The sending station should not flag a fault if

NAKs are repeatedly received for the same frame. If no flag is received after a period of at least

250mSec, the transmitting station should perform a resync as described in section 2.5.

Guaranteed/Reliable frame

Frame Start UBYTE 0x64

Frame Count UBYTE 0x01 – 0xFF (not including zero)

VERSION UBYTE 0x01

LEN ULONG Length of entire packet (not including FS FC, CS)

SRC UWORD/ULONG

DEST UWORD/ULONG

MSG_ID UWORD

FLAGS UWORD (there is no guaranteed bit)

(Payload)

Checksum UWORD CCITT-8

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Dbx full_duplex_data_link Manuale Utente Pagina 4