Keri Systems NXT-5R - Manual (Page 2)

NXT-1R/-3R/-5R Reader
Installation Guide
Page 2 of 3 P/N: 01999-001 Rev. E
2.4 Cable Options
RS-485 bus runs can daisy-chain together an NXT-4x4 and NXT-Reader on one line. The total cable run distance should
be less than 500 feet from the NXT controller for runs with 4x4s and less than 1,000 feet for Reader-only runs.
NOTE: Cable resistance causes a drop in voltage at the end of long cable runs. Ensure the appropriate power and current
for your device is available at the device at the end of the cable run. Heavier gauge cable reduces this affect.
NOTE: Keri does not recommend hot-plugging a Reader, RIM, or 4x4 into an NXT controller.

Remove power from the controller prior to connecting these devices.
Table 1: Reader and 4x4 Cable Options
Connection Type
Total
Run
Length
Shielded, Stranded,
2 Twisted-Pair
a
a. Keri recommends this cable type for best system performance.
CAT-5
b
b. Keri’s preferred low-cost option. Keri has no suggested vendor for this type of cable.
Shielded, Stranded,
4-Conductor
c
c. Use care when routing this type of cable as it can make the system more susceptible to EMI.
AWG Suggest AWG Suggest
RS-485 bus

from NXT-2D/-4D

to NXT-4x4 only
up to
500 feet
18 - Data plus
4x4 Power
22 - Data only
Belden
8723
unshielded 18 - Data plus
4x4 Power
22 - Data only
Windy City:
414302-S
West Penn: 244
Tappan:
1880AB4M-CM
RS-485 bus

from NXT-2D/-4D

to NXT-4x4

and NXT Readers
up to
500 feet
18 - Data plus
4x4 Power
22 - Data only
Belden
8723
shielded 18 - Data plus
4x4 Power
22 - Data only
Windy City:
414302-S
West Penn: 244
Tappan:
1880AB4M-CM
RS-485 bus

from NXT-2D/-4D

to NXT Readers only
up to
1,000 feet
22 for Data Belden
8723
shielded 22 for Data Windy City:
416303-S
West Penn: 241
Tappan:
2280AB4M-CM