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4-65
\ convert to \\
00 hex -- 1F hex convert to \ 80 hex -- \ 9F hex
A0 hex -- FF hex convert to \ 20 hex -- \ 7F hex
(excluding DC hex)
2) one-byte data transmitted as original data without converting
other codes unchanged
Host Transmissions
Transmission Format
Poll STX, ADDR
Host Data STX, CMD, data, CS1, CS2, ADDR
Acknowledgment ACK
Negative ACK NAK
Terminal Transmissions
Transmission Format
Terminal Data STX, data, CS1, CS2, ETX
Acknowledgment ACK
Negative ACK NAK
4.4.1. Protocol Operation
The terminal protocol operates as a multi-point stop and wait
protocol. A station sends only one frame and then stops and waits for
a response.
The following scenarios typify link transmissions (Poll):
* Terminal has no data for the host:
=> STX ADDR
<= EOT - if no data is ready for transmission
* Terminal has data for the host:
=> STX ADDR
<= STX <data> CS1 CS2 ETX - if data is ready