2 ] Control Characters - Denso BHT-100B User Manual

[ 2 ] Control Characters

The control characters are classified into two groups: transmission control characters
and text control characters.
(1) Transmission control characters
The transmission control characters listed below are used to compose transmission
control sequences in phases 1 through 3.
Symbol Value
EOT 04h
ENQ 05h
ACK 06h
NAK 15h
■
Transparency
The BHT uses the non-transparent mode which handles the control characters and
codes (e.g., STX, ETX, and SOH) as starting or ending markers and does not allow
them to be transmitted as normal data in the transmission texts.
Chapter 3. Communications Operations of the BHT-100Q/100B
Meaning
End Of Transmission
Enquiry
Acknowledge
Negative Acknowledge
117
Function
Releases a data link (Phase 3).
Requests abort of transmission
(Phase 2).
Requests establishment of a data link
(Phase 1).
Prompts the receiver to respond to
the sent text (Phase 2).
Acknowledgment response to ENQ
(Phase 1).
Acknowledgment response to text
(Phase 2).
Acknowledgment response to EOT
(Phase 3).
Negative acknowledgment response
to ENQ (Phase 1).
Negative acknowledgment response
to text (Phase 2).