DN1237-0003 © 1997-2000 Kantech Systems Inc.
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SECTION 11
SECTION 11
SECTION 11
SECTION 11
SECTION 11 - - C o m p a
- - C o m p a
- - C o m p a
- - C o m p a
- - C o m p a t i b i l i t y w i t h K T
t i b i l i t y w i t h K T
t i b i l i t y w i t h K T
t i b i l i t y w i t h K T
t i b i l i t y w i t h K T - 2 0 0
- 2 0 0
- 2 0 0
- 2 0 0
- 2 0 0
Step 12. Connecting the KT-200 to
the RS-485 Bus
(
Connect RS-485 cable to X1+ and X1-
(
Yellow RS485 EOL on last KT-200
Controllers are linked together using their communication PORT-
1 RS-485 communication protocol. The communication loop origi-
nates at the workstation computer.
The workstation communicates with the local first controller in RS-
232 protocol on the controller’s RS-232 port (TX2, RX2).
The RS-485 protocol will easily operate at high baud rates (up to
19,200), its immunity to interference is very high and maximum
communication loop length with the appropriate cable is 1,200
meters (4000 feet).
The RS485 communication loop originates from the first controller
or the VC-485 converter and runs sequentially to each KT-200
controller as a single communication line. Connecting several KT-
200 at a single point is not acceptable nor are “Y” or “spider web”
type networks.
The line must continue to each KT-200 and terminate with the
yellow 120 Ohms end of line resistor at the last KT-200 on the loop.
This method insures that the line is balanced and that both
conductors are the same length. The RS485 communication loop
should be wired with Ethernet grade 3 double pair network cable
(see cable specifications).
The RS485 loop can operate at 9,600 or 19,200 baud under normal
conditions. Intermittent communication problems or erratic op-
eration may require to slow down the network. Varying the
network speed does not perceptibly change the operation speed
of the system.
The network speed must be changed at each KT-200 on the loop
by setting DIP switches 6 and 7 as indicated previously. For the
change to take effect, the controller must be reset using the SW3
push button switch located on the bottom left side of the controller
circuit board.
Also, the system baud rate must be set from the operator's
microcomputer.
KT-200 Technical Specifications
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KT-200 Electrical Specifications
VO LTAG E
O U TPU TS
T YP IC A L
MAX
A B SO LU TE
CO MB I N ED MAX
L OCK 1 (+2 4/27 VDC)
L OCK 2 (+2 4/27 VDC)
1 25mA
1 25mA
500mA
1A
REA DER 1 V++ (+24/27 VDC)
REA DER 2 V++ (+24/27 VDC)
75 mA
75 mA
500mA
+2 4 V AUXILIARY PO WER
2 50mA
500mA
READER 1 5V (+5 VDC)
READER 2 5V (+5 VDC)
50 mA
50 mA
500mA
500mA
O P EN C OLL E CTOR
O U TPU TS
T YP IC A L
MAX
N O TES
OUT 1
20 mA
50m A
Output s are O pe n- Co lle ctor to
Groun d, cur rent limited by a 4 7
Ohm serie s resistor. Cur ren t is
dra wn fro m a bove o utpu ts (5 V o r
2 4V) and mu st b e includ ed in th eir
r espective calculation.
OUT 2
20 mA
50m A
OUT 3
20 mA
50m A
OUT 4
20 mA
50m A
