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SERIAL COMMUNICATIONS
Communication Protocol
Communication with all analyzers through the RS-485 connection uses
the following word format:
8 data bits
1 stop bit
No Parity
In addition, the baud rate is fixed at 9600bps.
The communication protocol is a basic master/slave, command/response
protocol. The master initiates each communication transfer. There is one
master on the communication line, but there can be multiple sensors act-
ing as slaves. Up to 32 sensors can be connected on one network.
Command Message Format
The command message format is as follows:
Start Character
Node Address
">" (ASCII charac-
2 Hex ASCII char-
ter 3E Hex)
acters (00 to FF)
Command Letter
Data
(See Command
(n characters -
Section for list of
depends on com-
commands)
mand)
Checksum
End Character
2 hex ASCII char-
Carriage Return
acters (sum of all
(ASCII character
preceding charac-
0D Hex)
ters except the ">"
character)
Serial Communications
|
A-1
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