Step 10•Connecting The Kt-100 To The Rs-485 Bus - Kantech kt-100 Installation Manual

K T - 1 0 0 I n s t a l l a t i o n
The normally closed tamper switch is connected to an input. It
is recommended to choose an unused input (3 or 4) as tamper
input.
1. Install the KT-100TAMP tamper switch in the MUSB
box as illustrated below.
KT-100
RELAYS
Z1 Z2
R1 R2 R3 R4
DOOR REX
TAMPER
Connecting the KT-100 to the RS-485 Bus
Step 10•
Controllers are linked together through their RS-485 screw
terminal. The maximum communication loop length with the
appropriate cable is 1.2 kilometers (4,000 feet) from the last
controller to the workstation.
NOTE: Do not connect several KT-100 controllers at a single
point or in a "Y" or "spider web networks".
The RS-485 communication loop should be wired with Ethernet
Category 3 double twisted pair network cable (see cable
specifications Belden 1227A or equivalent). The RS-485 loop
can operate from 1,200 to 115,200 baud, under normal
conditions. The baud rate depends on the loop length and the
environment (Refer to Step 2 "Selecting a Mounting Location"
on page 5).
NOTE: Intermittent communication problems or erratic opera-
tion may require to slow down the network speed to 9,600 or
19,200 baud. Varying the network speed does not perceptibly
change the operation speed of the system. Usually, most instal-
lations should be set at 19,200 baud.
To link KT-100 Door Controllers:
1. Connect the RS-485 cable to X1+, X1- and GND.
◗ If you are not using the USB-485 or VC-485:
connect a 120 ohm end-of-line resistor at the
interface of the first and last KT-100 (X- & X+);
8
M a n u a l
INPUTS
Z3 Z4
COM AUX AUX
TAMPER
SWITCH
ARM
MUSB
COVER
◗ When using the USB-485: connect a 120 ohm end-
of-line resistor on the last KT-100 only (X- & X+).
You do not need to connect the first KT-100 since
the USB-485 contains an end-of-line resistor.
USB CABLE (3 METERS MAX)
USB485
WITH 120 OHMS
INTEGRATED EOL
RESISTOR
RS-485
GND X- X+
RS485 NETWORK: UNSHIELDED TWISTED PAIRS CABLE AWG #22 (1200 METERS MAX)
NOTE: After you have completed all the necessary steps, you
may power the KT-100 by connecting the AC power and the bat-
tery.
MUSB
BOTTOM
WORKSTATION
KT-100 #1 KT-100 #2
RS-485 RS-485
X+ X- X+ X-
KT-100 #32
RS-485
X+ X-
120 ohms
EOL resistor