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C-17
Appendix C
Host Computer Interface
C.4.RS-232C Cable Connection
Preparing an RS-232C Cable
After obtaining an RS-232C cable, check that it is wired correctly, referring to the pin assignment
table in Appendix C. If you have an IBM communication adapter cable type 1502067, you will have
to resolder the wiring at the printer end of the cable. The procedure is as follows.
1. Unscrew the plastic cover from the printer end of the cable.
2. Next to each of the wires inside the cable is a bare shield wire. Solder all these shield wires
together into a single bundle.
3. Using a section of flat wire about 3 mm wide and 15 mm long, connect the bundle of shield
wires to the metal facing of the connector. Check that the solder connections are secure.
4. Desolder wires 2 and 3, then resolder them in crossed configuration. Solder wire 2 to pin 3 and
wire 3 to pin 2. Cover the solder joints with thermofit tube.
5. Cut wires 4, 5, 6, and 20.
6. Solder wires 5 and 6 together and connect them to pin 20. Cover the solder joints with thermofit
tube. Leave wire 4 unconnected.
7. Tape all remaining loose ends, or seal them with thermofit tube.
8. Screw the plastic cover back on.