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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:
• 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.
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
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