Appendices
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.
Establishment of Data Link
(Phase 1)
Data Transmission (Phase 2)
Sending
Station
| ENQ |
|
|
S |
| E | B |
O | Heading text | T | C |
H |
| X | C |
|
|
|
|
S |
|
|
|
T | Serial number | Data text 1 | |
X |
|
|
|
|
|
|
|
S |
|
|
T | Serial number | Data text |
X |
|
|
|
|
|
|
|
|
S |
|
|
T | Serial number | Data text n |
X |
|
|
|
|
|
Receiving
Station
ACK
ACK
EB T C X C
ACK
EB T C X C
ACK
EB T C X C
ACK
Release of Data | EOT |
Link | |
(Phase 3) | ACK |
|
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