Appendix A Serial Communications - Ametek Thermox 2000 ATEX Series User Manual

SERIAL COMMUNICATIONS
Serial communications for the Series 2000 (ver 3.3 and later)
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.
Command Message Format
The command message format is as follows:
Where:
Start Character Node Address
">" (ASCII 2 hex ASCII
character 3E Hex) characters (00 to
FF)
and the IQ based software
applies to IQ sensor based products only
IQ
applies to Series 2000 based products only
S2
Command Letter Data
(See Command (n characaters
Section for list of - depends on
commands) command)
Checksum End Character
2 hex ASCII Carriage return
characters (sum of (ASCII character
all preceding 0D Hex)
characters except
the ">" character)
Serial Communications
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