ditions, events and local alarms. Visual feedback of access operation is by LED. Aud-
ible warning devices, such as T-REX or reader buzzer, signal door alarms.
Connecting the KT-1
Connecting the VC-485 or the USB-485 to the RS-485 Bus:
Connect the RS-485 cable to (COM1) X+, X-. Controllers are linked together through
their RS-485 terminals. The maximum communication loop length is 1.2 km (4,000
ft) using appropriate cabling. The RS-485 communication loop should be wired with
Ethernet Category 3 double twisted pair (unshielded) network cable or better. The
RS-485 loop can operate from 1200 to 115200 Bauds under normal conditions.
Intermittent communication problems or erratic operation may require network
speed drops to 9600 or 19200 Bauds. Varying the network speed does not notice-
ably change the operation speed of the system.
Note 1: Connecting several KT-1 at a single point is not recommended, neither are
splitters or spider web (star) networks.
Note 2: There is no end-of-line resistor to install on the RS-485 COM1 terminals on
the last KT-1 controller of a loop
Note3: Use of VC-485 was not evaluated by UL.
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