Ametek Thermox 2000 ATEX Series, Руководство пользователя

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Serial Communications | A-1
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.
Command Message Format
The command message format is as follows:
Where:
Start Character Node Address Command Letter Data Checksum End Character
“>” (ASCII
character 3E Hex) 2 hex ASCII
characters (00 to
FF) (See Command
Section for list of
commands) (n characaters
- depends on
command) 2 hex ASCII
characters (sum of
all preceding
characters except
the “>” character)
Carriage return
(ASCII character
0D Hex)
SERIAL COMMUNICATIONS