Campbell Scientific CM6/CM10 Tripod Weather Station Installation - Manual (Page 38)

Section 3. Instrumentation Installation
5. Connect a null modem cable from the computer serial port to the RS-232
port of the RF500M. If a digital radio is being used on the RS-232 port,
an SC532 and serial cable can be used between the PC and the CS I/O port
of the RF500M. Set the appropriate configuration options in the RF500M
with Device Configuration Utility depending on the port connected to the
PC.
3.3.5.3 Install Nearest Repeater/Field Station
Now install the nearest field station. If it communicates with the base station
via a repeater, the repeater station must also be installed. Make sure the correct
RF ID has been configured in the RF500M that is being deployed in the remote
field station or repeater location.
Following is the order in which a general RF field station should be installed.
A repeater station is installed in the same order.
1. Tripod or tower
2. Enclosure and datalogger
3. Antenna - Orient correctly; remember direction and polarization
4. Solar Panel
5. Power Supply
6. Sensors
7. RF Modem - Configure the RF ID according to the site map
8. Radio - Make sure to connect to RF Modem, to power supply, and turn on
power supply
3.3.6 MD485 Multidrop Interface
Campbell Scientific’s MD485 is an intelligent RS-485 interface that permits a
PC to address and communicate with one or more dataloggers over a distance
of 4000 ft. The distance between the datalogger and computer can be
increased by combining it with a phone modem, Ethernet link, or spread
spectrum radio.
3.3.6.1 MD485 Multidrop Interface at the Datalogger
1. Mount the MD485 to the enclosure backplate via its onboard bracket.
2. Attach the SC12 cable’s female connector to the MD485’s CS I/O port.
3. Attach the SC12’s male connector to the datalogger’s CS I/O port.
4. Attach a twisted pair cable such as the CABLE3CBL to one of the
MD485’s RS-485 ports.
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