6.2.4 Generalised Message Format
5delimiter4 address command data 5delimiter4 checksum
delimiter: Function ASCII Hex
Start of text 5STX4 2h
End of text 5ETX4 3h
Acknowledge 5ACK4 6h
Not acknowledge 5NAK4 15h
address: The unique address of the HPA in the range:
Dec: 48 to 111
ASCII: 0 to o
Hex: 30h to 6Fh
The HPA will respond only to messages containing this address and
will ignore all other messages.
command: A character specifying a particular function for the HPA to perform.
The character can be in the range:
ASCII: 0 to 5DEL4
Hex: 30h to 7Fh
data: A parameter qualifying a command or data returned in response to a
command. Characters can be in the range:
ASCII: 5SP4 to 5DEL4
Hex: 20h to 7Fh
checksum: Bit by bit exclusive OR of all characters in message between and
including the delimiters. Characters can be in the range:
ASCII: 5NUL4 to 5DEL4
Hex: 0h to 7Fh
6.2.5 Command Message Format
5STX4 address command 5ETX4 checksum
Command message with no qualifying data.
5STX4 address command data 5ETX4 checksum
Command message including a qualifying parameter.
HBN63xx-1, Issue 8, Page 33
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