Manual

Keri Systems, Inc. Technical Reference Manual – PXL-250 and SB-293

Revision 5.5 P/N: 01836-004 Page 19

4.0 Cable Requirements

4.1 RS-232 Serial Cable

• four conductor, shielded, stranded, AWG 24 wire (such as Belden 9534 or a larger

gauge)

• 50 feet maximum length (per RS-232 industry specification)

4.2 RS-485 Network Cable

• two conductor, shielded, twisted pair, stranded, AWG 24 wire (such as Belden

9501 or a larger gauge)

• 16,000 feet total network length

• refer to the Network Wiring Application Note (P/N 01824-002) for specific

network wiring information

4.3 Input Power

• two conductor, stranded, AWG 18 wire (such as Belden 8461 or a larger gauge)

• 200 feet maximum cable length for systems using an SB-293 with two readers

NOTE: On long power cable runs, the resistance in the cable itself causes a drop in

voltage at the end of the run. Be sure that your power supply does provide 12 VDC at

the end of the cable run.

4.4 Earth Ground

• single conductor, AWG 18 wire (or a larger gauge)

1. Ground wire is green with or without yellow tracer.