5.1.2.2 Troubleshooting your hyperterminal interface
If serial communications with the Model 7100E fails, isolate the problem by performing the following tests:
Disconnect the RS-232 cable from the Model 7100E by removing the terminal block connector from TB3.
Insert a jumper between pins 9 & 10 on the terminal block connector. Enter a few letters from the PC
keyboard. The PC monitor should display the corresponding alpha-characters as they are typed. If the
letters do not display on the monitor screen, there is a problem with the RS-232 cable, the PC serial COM
port, or the HyperTerminal setup.
If the typed letters DO show on the monitor screen and serial communications with the Model 7100E still
has not been established, then PC COM port pins 2 & 3 (7100E pins 9 & 10) may be reversed. Verify the
cable wiring (section 2.1.3.10). If no transmitted data from the Model 7100E is seen on the monitor
screen, call the Neutronics Inc. Service Department for further assistance.
5.1.2.3 Organization of RS-232 serial data
There are three levels of access through the service port that can be used for interfacing with the Model
7100E:
1. Standard Access: ASCII dump to a PC, printer, or DAQ, and provides basic operator access.
2. Advanced Level-1 Access: Allows user setup and configuration, such as alarms, and data format.
3. Advanced Level-2 Access: Allows access to vital control areas via password.
5.1.2.4 Standard level access
Standard level access is the default level of access to the Model 7100E available to the user via a host
computer or printer over a standard RS-232 serial interface. In Standard Level access, the user can
make inquiries about oxygen concentration, sensor signal level, and other parameters for system
servicing, and troubleshooting.
When communications are established between the Model 7100E and a host computer, 2-way
communication begins automatically in Standard Level access. Data is sent out the analyzer RS-232
Service Port to the host terminal once-per-second, in the factory-default Human Readable format (section
4.1.2.4.2). There are no commands necessary to begin viewing information transmitted by the Model
7100E in Standard Level access.
To request and view specific information via the RS-232 interface, type the desired command key
selected from the Standard Access level command chart below (It is not necessary to press return).
Helpful Hint: For viewing convenience, before requesting specific information from the Model 7100E,
disable automatic 1-second updates from the Model 7100E and allow access of information by-request-
only (section 4.1.2.4.1), by typing “SSERFMT=0”, followed by the Return key. To return to automatic 1-
second updates of data from the analyzer in Human Readable format (section 4.1.2.4.2), type
“SSERFMT=1”, followed by the Return key.
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