Encompass 4 Reader System Guide
TransCore Proprietary.
4-58
To connect the colored-wire cable using RS–422 interface
1. Connect the yellow wire (tr) from the yellow and red wire pair to the host receive (+) signal.
2. Connect the red wire (transmit –) from the yellow and red wire pair to the host receive (–) signal.
3. Connect the black wire (r) from the red and black wire pair to the host transmit (+) signal.
4. Connect the red wire (receive –) from the red and black wire pair to the host transmit (–) signal.
Wiegand Interface
Wiegand interface signals are supplied by three wires from the Encompass 4 Reader communications
cable. The Encompass 4 Reader with RS–232 or RS–422 comes with the Wiegand option built in.
The Wiegand interface can only be used by the reader to output valid Wiegand tag reads. All reader
commands and responses are issued through the serial interface.
shows the Wiegand signals and the interface wires for the 13-pair cable. To see the alternate wire
(15-pair) assignments, refer to
“Table 50 Wiegand Interface Signal Wiring for Alternate Wire 15-Pair Cable”
Table 13 Wiegand Interface Signal Wiring for Colored-Wire 13-Pair Cable
Signal from Encompass
4 Reader
Colored-Wire Pair Cable
Connect to
Signal from
Host
Wire Pair from
Encompass 4
Reader
Color Used
Wiegand Zero Output
Blue/Red
Blue
Data0
Wiegand One Output
Red
Data1
Signal Ground
Yellow/Black
Yellow or black
a
Ground
a Black is recommended so that yellow can be used with RS-232. This helps to avoid confusion with having 2 black
wires on RS-232
To connect Wiegand interface
1. Connect the blue wire (data0) from the blue and red wire pair to the data0 wire of the Wiegand device.
2. Connect the red wire (data1) from the blue and red wire pair to the data1 wire of the Wiegand device.
3. Connect either the yellow or black
3
wire from the yellow and black pair to the Wiegand device’s signal
ground.
Note:
The RS–232 or RS–422 interface is still included on the Encompass 4 Reader even when
you use the Wiegand configuration. If serial communication is not needed, TransCore recommends
leaving the DB9 or DB25 connected to the cable for future use.
Note:
When extending the Wiegand interface, use a three-pair cable such as Belden 2919. Only one
signal ground wire should be used, not both. For example, use a twisted pair for Red (Data1) and
Blue (Data0) (Red and Blue twisted pair), and a twisted pair for Black (Signal Ground) of the Yellow
3
Black is recommended so that yellow can be used with RS-232. This helps to avoid confusion with having 2 blacks on RS-232.
Summary of Contents for encompass 4
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