MNA0010, Revision B October 2014
37
CHAPTER 6
Service Port: Serial Communications Interface
The model 7100P Portable analyzer features a service port which is accessible for monitoring
the analyzer output and for determining the active fault codes. The service port has been
designed for communication with a PC based computer (such as a Portable analyzer notebook
computer) over a standard RS-232 serial interface.
6.1
There are three levels of access through the service port:
1. STANDARD ACCESS: ASCII dump to a PC, printer or DAQ and provides basic operator
access.
2.
ADVANCED LEVEL 1 ACCESS: Allows setup and configuration of alarms, data format…
3. ADVANCED LEVEL 2 ACCESS: Allows access to vital control areas via password.
I. The
standard access
is available to the user via a host computer or printer over a standard RS-
232 serial interface. The host computer can forward inquiries about sensor temperature, oxygen
concentration, sensor voltage, and other parameters. The host computer may control analyzer
electronics, via the communications interface, by turning the communications line on or off.
NOTE!
If a computer is on line with the analyzer, a restart may be accomplished either by
simultaneously holding the “mode” and “UP” buttons on the model 7100P Portable
analyzer display panel for approximately 10 seconds or by turning the analyzer off
and then on.
The commands are
:
“A” returns the Short Software Version
“C” returns the Device Type
“E” returns the Device output in PPM O2
“H” returns the Fault Code
“I” returns the Fault Descriptions
“V” returns the Long Software Version
“@” returns the Neutronics Inc. Serial Number
S SERFMT=0 Disables RS 232 output
S SERFMT=1 Enables RS 232 output in HUMAN READABLE format
S SERFMT=2 Enables RS 232 output in MACHINE format w/o Checksum
S SERFMT=3 Enables RS 232 output in MACHINE format w/Checksum
S SERFMT=4 Enables RS 232 output in TAB DELIMITED (Excel) format.
S SERFMT=5 Enables RS 232 output in OA1 format.
The communications Interface can be operated at several BAUD rates, the factory default is 9600
BAUD. To operate the interface, the host sends an ASCII command letter to the analyzer. The host
computer then waits for the analyzer to respond. The analyzer responds no later than 0.5 second
after it receives the command letter. All responses are terminated with a carriage return. Data will be
sent out the RS232 to the host terminal every 1.0 seconds
. To end the communication, enter “S
SERFMT=0”.
