6.2.4
Generalised Message Format
5
delimiter
4
address
command
data
5
delimiter
4
checksum
delimiter:
Function
ASCII
Hex
Start of text
5
STX
4
2h
End of text
5
ETX
4
3h
Acknowledge
5
ACK
4
6h
Not acknowledge
5
NAK
4
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
5
DEL
4
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:
5
SP
4
to
5
DEL
4
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:
5
NUL
4
to
5
DEL
4
Hex: 0h to 7Fh
6.2.5
Command Message Format
5
STX
4
address
command
5
ETX
4
checksum
Command message with no qualifying data.
5
STX
4
address
command
data
5
ETX
4
checksum
Command message including a qualifying parameter.
HBN63xx-1, Issue 8, Page 33
