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C.4. RS-232C Cable Connection
C-12
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 ther-
mofit tube. Leave wire 4 unconnected.
7. Tape all remaining loose ends, or seal them with thermofit tube.
8. Screw the plastic cover back on.
Connecting the Printer to the Computer
1. Check that the power of both the printer and computer is switched off.
2. Discharge yourself by touching a metal object such as a doorknob.
3. Remove the plastic cap from the printer's RS-232C interface connector.
4. Plug the printer end of the RS-232C interface cable into the printer's RS-232C connector and
screw it in place.
5. Plug the other end of the cable into the computer's RS-232C interface connector.
6. Switch on the printer's power.
7. The printer's RS-232C parameters are factory-set to the following values:
Baud rate=9600 bps, Data bits (character length)=8 bits, Stop bits=1, Parity=None
The two RS-232C protocols are XON/XOFF and DTR. The printer performs both of them simul-
taneously, using positive logic for DTR.