Keri Systems SB-293 - Manual (Page 19)

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