Technical Manual

Technical Manual AM Systems
Connections v4.4 Page 33 of 72
BUS A
Field Bus A connector for RJ45 connection. Allows the board to be
connected in the Field Bus structure.
BUS A1
Analogue connection to the transceiver.
BUS B
Field Bus B connector for RJ45 connection. Allows the board to be
connected in the
Field Bus structure.
BUS B1
Analogue connection to the transceiver.
D7
Red LED. ON (blinking) when the receiver is in bootloader mode
(e.g., during firmware upload). OFF during normal operation.
D8
Green LED. ON indicates a connection with a host
computer/controller. OFF indicates that the connection with the host
is lost.
POWER
LED indicator. Lights up when power supply is received through the
Field Bus.
RESET
Reset button. Pressing this button will result in a software reset of
this board witho
ut interrupting the Field Bus.
TAMPER
External tamper connector.
Allows connection of a mechanical switch to detect unauthorized
opening of the antenna housing.
NOTE
: Not implemented yet in the antenna housing.
TERM
Field Bus termination switch.
The Field Bus needs to be terminated properly to avoid signal
reflections which can cause bad communication. The first and last
device in the Field Bus structure need to terminate the bus. Switch to
ON if this RX is the first or last device in the Field Bu
s.
VIS COUNT
Visitor counter connector.
Connect the wire to the visitor counter to this connector.
Table 4: The AM RX components
Pins 3 and 6 of RJ
-
45 connector BUS A are not connected to pins 3 and
6 on RJ
-45 connector BUS B.
Unlike the RF systems, pins 3 and 6 are
not used as synchronization wires, but for communication between the
transceiver and receiver.
For this reason it is not allowed to connect RF and AM systems on the
same Field Bus!