19/09/18
Page 10 of 67
ASR650 Operational Manual
2.1.4
Connecting the antenna to the reader board
The antenna has to be connected to ST7 of the reader board. The following table shows the
correct wiring of the antenna for each type of antenna cable.
Pin Number
Function
Twinax Cable (black)
Chainflex cable (purple)
1
Antenna 1
silver
white
2
Antenna 2
copper
brown
3
Antenna Shield
black
black
Agrident is only using these two types of antenna cable. If you are using third party antennas, the
colors of the antenna cable wires might vary.
Agrident highly recommends to use low capacitance antenna cable (twisted),
like TWINAX AWG 2x20 (IBM Nr. 7632211) or IGUS Chainflex
CFBUS.LB.021 (very flexible, also at low temperatures but more expensive).
2.1.5
Field Distribution
1. Single Antenna
The left picture shows the field distribution and lines of flux for a single antenna. This leads to
optimum
and
worst
reading orientations. Generally speaking, the transponder coil should be in
90 degrees to the field lines in order to achieve the best reading range.
In case of a single antenna, an ear tag has to be parallel (1) to the middle of the antenna panel
for the maximum read range
– a glass tag / bolus perpendicular. If the ear tag is rotated by 90
degrees off the optimum orientation (2), it cannot be read in the same position. But it can be read
at the sides of the antenna in this orientation (3) at about 60-70 percent of the reading range from
case (1).
(3)
(3)
(1)
B
ac
k
F
ron
t
(2)
ASR650
– ST7
Ant1
Ant2
GND
Antenna