Pub. # OM20-MSP3-3D
6-34
Figure 13.2 Inspecting pins on communication cable
2. Testing continuity on communication cable.
a) Unplug the communication cable from the PC.
b) Bring both ends of the communication cable close enough together to reach with a
voltmeter.
c) Set your voltmeter to resistance (or continuity). Check continuity between the
following pins:
(you will need to insert a solid-conductor wire or paper clip attached to a wire into the sockets of
the serial connector unless your voltmeter leads are very small)
Figure 13.3 9 pin serial connector (left) and 4 pin round connector (right)
4 pin connector
Serial connector
1
2
2
3
3
5
5 3 2
