2 ] Control Characters - Denso BHT-8000 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
DLE EOT 1004h
DLE ENQ 1005h
DLE ACK 1006h
DLE NAK 1015h
WACK 103Bh
! Transparency
The BHT uses the transparent mode which allows the control characters and codes (e.g., STX, ETX,
SOH, and DLE) to be transmitted as normal data in the transmission texts.
To transmit a DLE as normal data, type DLE DLE per DLE.
(2) Text control characters
The text control characters are used to format transmission texts. In the BHT-Ir protocol, they include the
following headers and a terminator.
Symbol Value
DLE SOH 1001h
DLE STX 1002h
DLE ETX 1003h
In the BHT-Ir protocol, you cannot change the values of the headers and terminator with the protocol
functions in BHT-BASIC.
Meaning
End Of Transmission
Enquiry
Acknowledge
Negative Acknowledge
Wait for Acknowledge
Meaning
Start Of Heading
Start Of Text
End Of Text
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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 DLE ENQ
(Phase 1).
Acknowledgment response to text (Phase
2).
Acknowledgment response to DLE EOT
(Phase 3).
Negative acknowledgment response to DLE
ENQ (Phase 1).
Negative acknowledgment response to text
(Phase 2).
Requests suspension of data reception
during erasure of the flash memory.
Function
Indicates the start of heading text (Phase 2).
Indicates the start of data text (Phase 2).
Indicates the end of data text (Phase 2).