User's Manual

LF Antenna Connections
Exciter EX21 Installation and Connections 3-3
LF Antenna Connections
The LF antenna is a 7-turn loop coil with the tap at the first turn. To create this multiturn loop and
the proper tap connection, complete the following steps:
1. Position the antenna cable inside the plastic box as shown in the assembly drawing 900061.
Cut the end closest to the terminal block - 110mm long, and the other - 360mm long.
2. Remove 80mm of the outside cable jacket, and strip about 8mm from each conductor isolation.
3. Using a screwdriver, connect the antenna cable conductors in the terminal block as shown in
Figure 3-1.
Figure 3-1: LF Antenna Connections
Connecting the RS485 Communication Lines
The RS485 connectors and jumpers are located on the LFA21 assembly placed inside the plastic
enclosure (see the assembly drawing 900061). Two separate RS485 two-wire lines are used to
transmit data from/to the Reader. For detailed information on the RS485 two-wires interface (half-
duplex), see the RFID System S21 Technical Guide.
Notes 1. For the RS485 line, use specially designed cables only, such as BELDEN type 9842, or similar.
For more information, see the RFID System S21 Technical Guide.
2. To simplify the RS485 multidrop-type connection, the two RS485 connectors, TB4 and TB6
are wired in parallel on the LFA21 board. Connect the RS485 incoming cable to one connector
and the RS485 out going cable to the other.
1
2
BLACK
WHITE
RED
BROWN
GREEN
BLACK
RED
BROWN
BLUE
ORANGE
ORANGE
GREEN
BLUE
WHITE
Black
Red
White
From Exciter
LFA21
Assembly
7 Conductors
Antenna Cable
Ends
7
8
3
4
5
6
Terminal Block