Denso BHT-7500S User Manual page 154

(2) Text control characters
The text control characters are used to format transmission texts. In the BHT-protocol,
they include the following headers and a terminator.
Symbol Value
SOH 01h
STX 02h
ETX 03h
You may designate values of headers and a terminator with the protocol functions in
BHT-BASIC. If you designate none of them in a user program, the BHT may apply
those as listed above. Refer to the "BHT-BASIC Programmer's Manual."
Meaning
Start Of Heading
Start of Text
End of Text
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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).