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CyberResearch
®
Serial Communications COMT 366 Series
CyberResearch, Inc . 7
25 Business Park Drive P: (203) 483-8815; F: (203) 483-9024
Branford, CT USA www.cyberresearch.com
5.0 Troubleshooting
The following is a list of possible problems that may arise during the installation and
solutions to those problems:
1. The data being received is garbled.
a) The DTE/DCE switch is not set properly (see Section 3.0, "Installation" ). On the
COMT 366, observe the LCD and verify that TD and RD are shown as low in the
quiescent state (see Section 1.1,
"The LCD" ).
b) The equipment that the COMT 366 is connected to does not have the communication
parameters set the same.
On the COMT 366 look at the LCD, if RD is shown as a constant high or streaming (see
Section 1.1,
The LCD" ) then the wires are reversed.
d) One of the two wires is broken.
2. No data is being received.
a) Customer equipment not connected
b) The DTE/DCE switches are not set properly (see Section 3.0, "Installation" ).
c) One or more wires between the modems are open.
d) Link connection exceeds maximum specified distance. Individual converter
performance can be verified if the device to which the converter is connected is capable
of full-duplex operation. A standard CRT terminal is ideal for this test. In this mode the
terminal will generate data from its keyboard and be transmitted via Pin 2. However, data
will not be displayed until it is received at its input port, Pin 3.