DKS 1812 Owner's Manual page 22

RS-485 Connections
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1
1
2
3
BAD DNS
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5
6
7
3
8
Each RS-485 device (keypad, card
reader, receiver) must have a
unique address, starting with 003.
Do not skip addresses. The order
in which the device addresses are
connected to the 1812 does not
matter. What is important is that
the addresses must be in
sequence, starting with 003.
Valid device addresses for use
with the 1812 Access Plus system
are 003, 004, 005, 006, 007 and 008.
The device address is referred to
as a relay number in the
programming software. The relays
on the 1812 circuit board are 001
and 002.
In this example, the keypad is
relay 003, the card reader is relay
004 and the MicroPlus Receiver is
relay 005.
The wires connecting terminals 1 & 2 from the 1812 Access Plus to terminals 8 & 7 on the RS-
485 boards MUST be twisted. We recommend that you use Cat5e cable. Use one pair to
connect these terminals (terminal 1 connects to terminals 8; terminal 2 connects to terminals 7)
1
and then one wire from the other pairs to connect the common terminal (terminal 3 from the
1812 Access Plus to terminals 6 on the RS-485 boards).
The wires connecting terminals 7 & 8 between RS-485 boards MUST be twisted. We
recommend that you use Cat5e cable. Use one pair to connect terminals 7 & 8, and then one
2
wire from the other pairs to connect terminal 6.
If wiring will be outdoors or underground, use Cat5e Gel Filled (flooded) UV Resistant Direct
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Burial Cable.
Maximum distance from end to end is 4000 feet in a Daisy Chain format as shown.
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Termination switch is in the OFF position for middle units , and in the ON position for end units.
If terminals 6, 7 & 8 have two wires connected to them, the termination switch must be OFF. If
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terminals 6, 7 & 8 have only a single wire connected, the termination switch must be ON.
The 1812 system does not have to be on the end of the Daisy Chain wiring scheme . What is
important is that the distance restriction (4000 Ft.) be observed and that the devices at the end
of the chain have their termination switch turned ON.
Page 22
RS-485 RX
LAN DOWN
ON
SW1 MODEM / TCP ENB
Phone Line
In Use
Keypad
Address 003
MASTER CODE
1 2 3 4 5 6 7 8 9 10
OFF
2
RS-485 Terminal Connections
Access Plus Board
Term 1
RS-485 Data A ( + )
Term 2
RS-485 Data B ( - )
Term 3
RS-485 Common
Terminal 1 from the Access Plus board connects to RS-485 board(s) terminal 8.
Terminal 2 from the Access Plus board connects to RS-485 board(s) terminal 7.
Terminal 3 from the Access Plus board connects to RS-485 board(s) terminal 6.
Wires connecting terminals 1 & 2 to terminals 8 & 7 MUST be twisted.
Card Reader
Address 004
17 16 15 14 13 12 11
5
1 2 3 4 5 6 7 8 9 10
5
2
3
1812
Term Sw OFF
Controller
Address 005
End Unit
Term Sw ON
ON
1812
Term Sw OFF
Controller
DOORKING, INC., INGLEWOOD, CA 90301
Title: 1812 Access Plus
RS-485 wire connections.
Date: 6/09
RS-485 Board
Term 8
RS-485 Data A (+)
Term 7
RS-485 Data B ( - )
Term 6
RS-485 Common
MicroPlus Receiver
Address 005
SW4 SW2 SW3 ON
5
SW5
1 2 3 4 5 6 7 8
2 4
3
4000 Ft. Maximum
Address 003 Address 004 Address 005
Middle Unit Middle Unit End Unit
Term Sw OFF Term Sw ON
ON
OFF OFF
Correct
Address 004 Address 003
Middle Unit End Unit
1812
Term Sw OFF Term Sw ON
Controller
ON
OFF
Correct
Address 003 Address 004 Address 006
Middle Unit Middle Unit End Unit
Term Sw OFF Term Sw ON
ON
OFF OFF
Wrong!
A
Dwg. No. M1812AP-002 Rev.
1812-162-B-6-09