CyberResearch® Serial Communications

COMT 366 Series

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.

CyberResearch, Inc.

7

25 Business Park Drive

P: (203) 483-8815; F: (203) 483-9024

Branford, CT USA

www.cyberresearch.com