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DN1726-0811
22
Connecting the KT-400 Ethernet Four-Door Controller
Connecting the VC-485 or the USB-485 to the RS-485 Bus
Connect the RS-485 cable to (COM1) + 485 - and the RS-485 signal ground to the 12 VDC AUX - (negative)
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 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 perceptibly change the operation speed of the system.
Note 1: Most installations should be set to 38400 Bauds.
Note 2: Connecting several KT-400 at a single point is not recommended neither are splitters or spider web (star) networks.
Note 3: If the 12 VDC - is already used, the RS-485 signal ground can be connected to the other GND terminals on the KT-400.
The EGND (earth ground) terminal cant be used for signal ground, only use the GND and 12 VDC - (negative)
terminals for signal ground.
Note 4: There is no end-of-line resistor to install on the RS-485 COM1 terminals on the last KT-400 controller of a loop.
Note 5: If you must make up your own RS-232 cable
with a RJ-12 connector, refer to the following
diagram for the RJ-12 pin-out.
VC-485
(Preferred for Global Edition)
USB-485
(Preferred for Special Edition and
Corporate Edition)
RS232
GND
V+
GND
X- X+
RJ-12
V+
RECEIVE
TRANSMIT
PWR
RS-485
ORANGE
BLUE
WHITE
Up to 1.2 Km (4000 ft )
to the last controller
WHITE
BLUE
ORANGE
ORANGE
BLUE
WHITE
Max 30 m (100 ft)
DB25F
DB9F
VC-485
RS-232 / RS-485 CONVERTER
KANTECH SYSTEM INC.
Montreal - Canada
X+ X- GND
USB-485
RX
TX
PWR
USB
Powered from USB port
RS-485
DN1485-0302
To USB Port
To RS-232 Port
Max 0.9 m (3 ft)
POWER
GND V+
RS-232
GND
RS-485
X- X+
6 CTS WHITE
1 RTS BLUE
2 GND YELLOW
3 TX GREEN
4 RX RED
5 GND BLACK
RJ-12