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3
If Packet Protocol is enabled, messages must conform to the following
format:
STX Addr Message Characters..ETX Checksum
Where
STX and ETX are ASCII characters
Addr is the 2307/2367's address
Checksum is a 8 bit checksum created by exclusive ORing
all of the characters from the STX to the ETX character.
The 2307/2367 responds to each valid packet with an ACK response packet
if the message was a query or with an acknowledgment response if the
message was not a query. The command acknowledgment packet contains
the ESR register value. e.g.
ACK Addr ESR Register Value ETX Checksum
ACK Addr Optional query response..ETX Checksum
A NAK packet with the following format is returned if the original packet
had a bad checksum or if there was a command problem.
NAK Addr ESR Register Value ETX Checksum
Some command-response examples are:
Message
Packet
*CLS
02 34 2A 63 6C 73 03 63
ACK 4 0
06 34 30 03 01
*xxx
02 34 2A 78 78 78 03 67
NAK 4 32
15 34 33 32 03 23
*esr?
02 34 2A 65 73 72 3F 03 44
ACK 4 32
06 34 33 32 03 30
*idn?
02 34 2A 69 64 6E 3F 03 43
ACK 4 ICS-..
06 34 49 43 53 20 45.....2E 32 32 03 08
