Cable Specifications; Grounding; Table 1 - Cable Specificationss - Keyscan CA250 Series Technical Manual

Cable Specifications

The following table outlines system cable specifications. Please be sure to review grounding guidelines for safe
system operation. Avoid running access control cables parallel with AC wires or across fluorescent light
fixtures. This can cause AC induction or transmission interference.
Device / Circuit
Board
Readers to ACU
(includes HID iClass
– Rev B & Rev C)
Exception Readers to
ACU – PX-620, HID-
5375, MR-10, MR-
20, HID-iClass (Rev
A), iClass KEYRK40
and elevator readers
Door strikes &
electro magnets to
ACU
Contacts & exit
devices
Motion sensors (PIR)
CIM
Direct serial
PC to ACU
NETCOM to ACU
WIEEX2 (Wiegand
protocol extender)
Relay Floor Wiring
for floor control
(Optional)
Floor Input Wiring
for floor reporting

Grounding

Ground all access control units and shielded cables to a cold water pipe. For multiple access control units, all
shields should be connected to a single point earth ground.
Keyscan Inc. – Technical Guide (PC109x - 07.15)
Table 1 – Cable Specificationss
Signal Maximum Distance
Protocol
Wiegand 500 ft / 152.4 m
Wiegand 500 ft / 152.4 m
n/a 500 ft / 152.4 m
n/a 500 ft / 152.4 m
n/a 500 ft / 152.4 m
CAN Bus 1 3280 ft / 1000 m @ 9600 BPS
3280 ft / 1000 m @ 19,200 BPS
984 ft / 300 m @ 57,600 BPS
262 ft / 80 m @ 115,200 BPS
RS-232 100 ft / 30 m @ 9600 BPS
49 ft / 14.9 m @ 19,200 BPS
26 ft / 8 m @ 57,600 BPS
9.8 ft / 3 m @ 115,200 BPS
n/a 4000 ft / 1219.2 m
n/a 500 ft / 152.4 m
n/a 1000 ft/304.8 m
Cable Type Notes
6 conductors Overall shielded cable
shielded 22 AWG accepted. CAT5 cable not
acceptable with Wiegand
signal protocol.
6 conductors Overall shielded cable
shielded 18 AWG accepted. CAT5 cable not
acceptable with Wiegand
signal protocol.
1 pair 18 AWG Shielded wire not required.
1 pair 22 AWG Shielded wire not required.
2 pairs 22 AWG Shielded wire not required
CAT 5 – 2 Maximum overall distance
twisted pairs between first and last CIM
units
5 conductors 22 Overall shielded cable
AWG shielded accepted. CAT 5 cable not
acceptable with RS-232
signal protocol.
CAT 5 – 1 If powering transmitter
twisted pair locally, 18 AWG power
communication. wiring is not required. Kit
1 pair 18 AWG includes 1 transmitter & 1
power to TX. receiver.
1 pair 18 AWG Shielded wire not required.
1 pair 22 AWG Shielded wire not required
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