Download CRC Technical Reference Manual

Installation
Wiring the CRC
SAC bus wiring
If the CRC is going to be used in an integrated system with a
control panel, the CRC must be wired to the 3-SAC Security
Access Control module. The 3-SAC supports the SAC bus, an
RS-485 communication line.
The 3-SAC module can support Class A or Class B wiring. If
Class A, the 3-SAC can support 30 CRCs or KPDISPs. If Class
B, the 3-SAC can support 62 CRCs or KPDISPs (31 per loop).
Recommended cabling
Since our security and access control devices require 24 Vdc, we
suggest that you always use a four-wire cable for the SAC bus
and a 24 Vdc power supply.
For the data wires, use unshielded, twisted pair, with greater
than 6 twists per foot, in 14 to 22 AWG (1.50 to 0.25 sq mm).
For the power wires, use 14 or 16 AWG.
You can use a four-conductor cable with an overall jacket
containing solid 2-19 AWG and 2-16 AWG for the SAC bus.
The maximum run from a CRC to the 3-SAC is 4,000 ft
(1,220 m) at 25 pF/ft. The maximum total capacitance of the run
is 0.1 µF, and the maximum total resistance is 52 Ω.
Powering the CRC
The CRC can be powered in several ways, as described in
Chapter 4, Access Control Applications. Each method requires
specific jumper settings and wiring to allow the CRC to operate
and communicate properly.
Note: Be sure to make the correct jumper settings for the CRC,
as described on the CRC - Card Reader Controller Installation
Sheet (P/N 387625).
24 Vdc wiring
The CRC can receive 24 Vdc power from the control panel
power supply. Simply use the 24 Vdc terminals on the CRC and
control panel power supply.
Transformer wiring
The CRC can be powered from an external transformer, the
CRCXF. Connect the transformer to the 16.5 Vac terminals in
the CRC. Note that all connected CRCs or KPDISPs must have a
CRC Technical Reference Manual
Technical Manuals Online! - http://www.tech-man.com
5.5