Connecting The Reader; Cabling Distances - GE Interlogix 840 Installation Manual

Connecting the Reader

Cabling Distances

The table below gives the maximum cabling distances between the reader
and the microcontroller.
13.6 Volts (see Note 1)
18
AWG
2750 ft
838m
NOTES:
1. Reader supply voltage measured at microcontroller: 13.6V is nominal
when line-powered; 12V is nominal when battery-powered.
2. All cable distances are typical maximums.
3. Readers powered by a local 12VDC power supply will have a maximum
cable distance of 500 feet (152m) of 24 AWG telephone wire.
4. The reader will work well with unshielded cable in most environments.
No company can guarantee that data will be reliably transmitted for long
distances on unshielded cable in every installation. Typical Wiegand
reader installation requires eight-conductor shielded cable to provide
reader power, controller communication, door contact, exit push
button, and tamper switch status. The same functionality is provided by
Proximity Perfect readers, "supervised" with four-conductor unshielded
cable.
6 Model 840/845 Contactless Smart Card Reader
TABLE 1: Cable Distances
12 Volts (see Note 1)
24 18
AWG
750 ft 2000 ft
229m 610m
24
AWG AWG
500 ft
152m