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Appendices
ENQ
S
O
H
ACK
ACK
ACK
ACK
ACK
EOT
ACK
E
T
X
B
C
C
S
T
X
E
T
X
B
C
C
S
T
X
E
T
X
B
C
C
S
T
X
E
T
X
B
C
C
Establishment of
Data Link
(Phase 1)
Heading text
Data text n-1
Serial number
Serial number
Serial number
Data text n
Data text 1
Data Transmission
(Phase 2)
Release of Data
Link
(Phase 3)
Receiving
Station
Sending
Station
Appendix B.
Communications Protocol Details
B.1 BHT-protocol
[ 1 ] Transmission Control Sequences
Shown below is a typical message transmission sequence supported by the BHT-
protocol. This sequence example does not include transmission errors or negative
responses.