RS-232 Wiring
RS-232 devices can be wired to either the terminal blocks on the motherboard or they can be connected to the 25-pin D connectors on the RS-232
daughter card. In both cases, cables and/or connectors are not supplied.
Refer to Figure 10 for the pin-outs of these terminal blocks and connectors.
Figure 10: RS-232 Pin-outs
Note:
• If PROM size equals 256 K, install jumper at P1-1 & P1-2. If PROM size equals 512 K, install jumper at P1-2 & P1-3.
• RS-232 Power – 10 mA (maximum).
• All wiring is supervised.
• For a DC-operated printer, the maximum distance is 395 feet (120 meters) for 14 AWG (2.081 mm
2
) or 625 feet (191 meters) for 12 AWG
(3.309 mm
2
).
• All wiring is 18 AWG (0.8321 mm
2
) or to local code.
• Use of CTS line is required (with or without supervised circuit).
• When using Service Modem 565-279, connect to Board 565-415 using Cable 733-808 in Shipping Group 740-850. Use Cable 171-095 to
connect the modem to a phone jack and/or a telephone termination block. Cut off one end of Cable 171-095 if connecting to a telephone
termination block. Strip back the cable to connect the two center wires to the red and green wires in the block. Refer to Test Specification
576-241 for instructions on how to communicate with the modem. Place jumpers across 1-2 of P4 and 2-3 of P5 on the service modem.
page 11
579-221 Rev. F
4100-6038 Dual RS-232 Module Installation Instructions
