Appendix C, RS-232 Output
Chemgard Infrared Gas Monitor
Three types of messages can be
transmitted from the RS-232 port:
•
status
•
data and
•
events.
Status
Status is the first message.
•
The first seven characters are the gas type.
•
The next three characters are the point
number, followed by the concentration and the
units.
•
The second line is the instrument state and
the alarm level.
•
The Trouble State shows the type of fault
detected; see TABLE C-2
•
This message is sent every 10 seconds.
Data Logged Value
The data logged value is the next message.
•
The first line indicates the date and time.
•
The second line shows the:
•
point
•
gas type and
•
logged concentration.
•
The message is generated for every point and
sent every 15 minutes or hourly, depending on
the setup selection.
•
The concentration is an average or the
maximum values for the selected time frame;
see TABLE C-3.
Alarm Events
Alarm events is the last message type.
•
The first line is the date and time.
•
The second name is the:
•
point
•
gas name and
•
alarm level.
•
See TABLE C-4.
All of these messages are initiated by the sync
character, followed by a binary address byte, 40
ASCII characters, and terminated with a line feed
and carriage return.
Table C-2. Status Message
To Next Page
Loading...
