4.1.2.2 Troubleshooting Your HyperTerminal Interface
If serial communications with the model 1100 fails, isolate the problem by performing the following
tests:
Disconnect the RS-232 cable from the model 1100 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 1100
still has not been established, then PC COM port pins 2 & 3 (1100 pins 9 & 10) may be reversed.
Verify the cable wiring (section 2.1.3.10). If no transmitted data from the model 1100 is seen on
the monitor screen, call the Neutronics Inc. Service Department for further assistance.
4.1.2.3 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 1100:
Standard Access: ASCII dump to a PC, printer, or DAQ, and provides basic operator access.
Advanced Level-1 Access: Allows user setup and configuration, such as alarms, and data format.
Advanced Level-2 Access: Allows access to vital control areas via password.
4.1.2.4 Standard Level Access
Standard Level Access is the default level of access to the model 1100 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 1100 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 1100 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
1100, disable automatic 1-second updates from the model 1100 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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