19
CHAPTER 5: Troubleshooting
The loopback-test procedure:
Connect a PC or dumb terminal to the RS-232 side of the interface converter
via a cable with a DB25 male connector. (This cable
must
have straight-
through pinning;
none
of its leads can be shorted together. Plus, the RS-232
side of the converter must be set to DCE.) Then, on the MIL 188/114
interface, short pins 19 and 13 together, pins 4 and 5 together, pins 20, 6,
and 8 together, pins 23, 22, and 10 together, pins 2 and 3 together, and
pins 14 and 16 together.
Next, type a few characters on the PC or terminal keyboard. If the same
characters you’ve typed appear on the screen, nothing is wrong with either
the interface converter’s data transmitting/receiving capabilities nor the
handshaking. Check the RS-232 and MIL 188/114 equipment you are
connecting to the interface converter again.
If no characters appear on your screen, either the converter’s data
transmitting/receiving capabilities or its handshaking components are
malfunctioning. Contact Technical Support for further assistance.
