Serial Communications
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SERIAL COMMUNICATIONS
Serial communications for the Series 2000 (ver 3.3 and later) and the IQ based software
IQ applies to IQ sensor based products only
S2 applies to Series 2000 based products only
Communication Protocols
Communication with all analyzers through the RS-485 connection uses
the following word format:
•8databits
•1stopbit
•NoParity
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.
Start Character Node Address Command Letter Data Checksum End Character
“>” (ASCII charac-
ter 3E Hex)
2 Hex ASCII char-
acters (00 to FF)
(See Command
Section for list of
commands)
(n characters -
depends on com-
mand)
2 hex ASCII char-
acters (sum of all
preceding charac-
ters except the “>”
character)
Carriage Return
(ASCII character
0D Hex)
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