TRANSIT ENTRY | INSTALLATION GUIDE
Connections
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3.4.2
RS422 CONNECTION
The TRANSIT Entry has an on-board RS422 interface. The communication protocol,
baud rate, data format and flow control depend upon the reader firmware. See
firmware manual for details.
The RS422 interface is similar to the RS232 interface. The RS422 interface is
commonly used where longer cable lengths are required.
Connections:
RX+
Receive line (positive)
RX-
Receive line (negative)
GND
Ground
TX+
Transmission line (positive)
TX-
Transmission line (negative)
RX+ and RX- inputs are terminated with a 120Ω resistor.
TX+ and TX- must be terminated at the host side.
TX
-
TX+
GN
D
RX+
RX
-
HOST
Figure 11: RS422 wiring
Note
Maximum cable length
1200 meters (4000 feet).
Note
Enable the on-board RS422
interface by setting DIP-
switch SW1-2 to OFF. See
chapter 0 for details.
Note
The RS422 interface is
disabled while the USB
interface is in use !!!
