6100 BSC Programming Manual

Writing Applications that Use 6100 BSC
SEND TTD. This request sends a TTD sequence to the remote
station, then waits for a NAK reply. TTD indicates a temporary
inability to transmit data, as described in Section 1 of this
book. It makes sense only in WRITE state, and only if this is
the transmitting station. When the request completes,
the line is in WRITE state, just as before.
The request buffer format is:
Function := 67
Modifier := 5
Request ID := A unique value from 1 to 32767,
application-determined
Text Out := Doesn't matter
Text In := Doesn't matter
Text := None
The response buffer format is:
Response := 67
Status := 0 if the operation succeeded, otherwise
a code for the error that occurred
Request ID := The same as in the request
Detail := A status detail code, containing more
description of request status
Text In := 0
Text := None
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