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[ 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 Meaning Function
DLE EOT 1004h End Of Transmission Releases a data link (Phase 3).
Requests abort of transmission (Phase 2).
DLE ENQ 1005h Enquiry Requests establishment of a data link
(Phase 1).
Prompts the receiver to respond to the sent
text (Phase 2).
DLE ACK 1006h Acknowledge Acknowledgment response to DLE ENQ
(Phase 1).
Acknowledgment response to text (Phase
2).
Acknowledgment response to DLE EOT
(Phase 3).
DLE NAK 1015h Negative Acknowledge Negative acknowledgment response to DLE
ENQ (Phase 1).
Negative acknowledgment response to text
(Phase 2).
WACK 103Bh Wait for Acknowledge Requests suspension of data reception
during erasure of the flash memory.
! 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 Meaning Function
DLE SOH 1001h Start Of Heading Indicates the start of heading text (Phase 2).
DLE STX 1002h Start Of Text Indicates the start of data text (Phase 2).
DLE ETX 1003h End Of Text Indicates the end of data text (Phase 2).
In the BHT-Ir protocol, you cannot change the values of the headers and terminator with the protocol
functions in BHT-BASIC.
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