PRX-TSEC
tSec Multi-Technology Card Reader
Installation Manual | June 2017
15
6
RS-485 Connection
Connection of an RS-485 Interface allows the tSec Reader to communicate using an intelligent protocol or to
send data to an ASCII capable terminal. The connection diagram below shows the interface requirements.
When connected in this way, the other wires should not be connected to ground and be appropriately isolated.
AUX+
AUX-
N+
N-
NA
NB
PURPLE
YELLOW
BLACK
RS-485 USB Converter
330R
330R
WHITE
BROWN
RED
RS-485 Interface
i
Connect the reader shield to a suitable earth point. DO NOT connect the shield to a ground or AUX
connection.
Warning: When connecting the Reader in RS-485 Mode you must isolate all unused wiring. DO NOT
terminate any unused connections to ground or a voltage or to another connection. Doing so may
damage the unit and will void any warranty.
A 330 Ohm EOL (End of Line) resistor MUST be inserted between the NA and NB terminals of the
Reader and a second 330 ohm EOL resistor must be inserted between the NA and NB terminals at
the other end of the wiring.
UL
ULC
The RS-485 Connection has not been evaluated for UL/ULC installations.