Chapter Two
Installation
Page 13 November
2008
Directional radomes should be installed with the central beam horizontal and must be pointed
exactly in the direction of transmission to benefit from the gain of the antenna. Parabolic
antennas should be mounted as per the manufacturer’s instructions, with the parabolic grid at the
“back” and the radiating element pointing in the direction of the transmission.
Ensure that the antenna mounting bracket is well connected to “ground/earth.”
2.3 Power
Supply
The D2 W MDME 2400 module can be powered from a 9 - 30VDC power supply. The power
supply should be rated at 1 Amp. The positive side of the supply must not be connected to earth.
The supply negative is connected to the unit case internally. The DC supply may be a floating
supply or negatively grounded.
The power requirements of the D2
W MDME 2400 unit are 240mA
@ 12V or 150mA @ 24VDC.
This is inclusive of radio and
Ethernet ports active, and serial
port plugged in. Transmission
current is nominally 350mA at
12V (200mA at 24V) for the
100mW RF unit, and 500mA at 12V (350mA at 24V) for the 300mW RF unit.
A ground terminal is provided on the back of the module. This terminal should be connected to
the main ground point of the installation in order to provide efficient surge protection for the
module (refer to the Installation Diagram for more information).
2.4 Serial
Connections
2.4.1
RS232 Serial Port.
The serial port is a 9-pin DB9 female, and provides for connection to a host device as well as a
PC terminal for configuration, field testing, and factory testing. Communication is via standard
+
_
B
A
-
+
COM
DIO
D2 W MDME
2400
9 - 30
VDC
RS485
SUPPLY
D2 W MDME
DB9
MALE
DTE HOST
DB9
FEMALE
D2 W MDME
DB9
MALE
DCE HOST
DB9
MALE
