The standard RS–232 connection maximum distance depends on the baud rate, cable type, and the
RS–232 device at the other end.
Note: When extending the RS-232 interface, use a three-pair cable such as Belden 2919. Use a
twisted pair for the black (RxD) with ground (yellow of the black/yellow pair), and a twisted pair for
red (TxD) with ground (yellow of the black/yellow pair). The third pair of the three-pair cable can
be used for a spare in the event either of the other two pair are damaged or fail. The cable shield
should be tied to a single-point earth ground on the controller end of the cable.
RS–422 Interface
Use an RS–422 interface if one or more of the following conditions apply to your site:
• The host computer is more than 50 ft (15.2 m) from the Encompass 4 Reader
• The host computer has an external limited-distance modem
The standard RS–422 connection maximum distance depends on the baud rate, cable type, and the
RS–422 device at the other end.
Wiegand Interface
The Encompass 4 Reader can interface with equipment requiring the Wiegand +5VDC data0-data1-signal-
ground interface. The reader uses the Wiegand interface included with the RS–232 or RS–422 option.
Note: The Encompass 4 Reader comes from the factory with eitherRS–232 and Wiegand or RS–
422 and Wiegand. If you want to use Wiegand, you must first connect the Encompass 4 Reader
using the RS–232 or RS–422 interface, set all necessary operating parameters in the reader, then
set the Encompass 4 Reader’s configuration to Wiegand, and then connect the Encompass 4
Reader to the Wiegand interface.
Note: You must order tags programmed with Wiegand-formatted data when using a Wiegand-
compatible reader.
Note: When extending the Wiegand interface, use a three-pair cable such as Belden 2919. Use a
twisted pair for the red (Data1) with ground (black of the black/yellow pair), and a twisted pair for
blue (Data0) with ground (black of the black/yellow pair). The third pair of the three-pair cable can
be used for a spare in the event either of the other two pair are damaged or fail. The cable shield
should be tied to a single-point earth ground on the controller end of the cable.
Input/Output Circuits
To connect the Encompass 4 Reader to external equipment such as a treadle or trac control light, install
wires from these devices at the junction box. The Encompass 4 Reader input circuit is designed to connect
to a dry contact closure. The Encompass 4 Reader output circuits are single-pole, double-throw relays
providing dry contact closures. These contacts are rated at 42.2V AC peak (30V
rms
) or 60V DC, at 1 A
maximum with non-inductive load.
Output circuits are not intended for the direct control of electromechanical devices such as motorized gates
and barrier arms. For such applications, the Encompass 4 Reader output circuits should be used to drive a
secondary, appropriately rated high-power relay.
Encompass 4 Reader System Guide
TransCore Proprietary.
2–18
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