Anemometer; Wiring; Connecting Rs-485; Connecting The Power Supply - RainWise MKIII-MB User Manual

ANEMOMETER

The anemometer is directly attached to the top of the sensor assembly. For correct wind direction
operation, the MKIII-MB must be oriented correctly.
By default, the MKIII-MB is configured for operation in the Northern hemisphere. This only requires that
the optional solar radiation sensor faces due South. If the MKIII-MB is going to be used in the Southern
hemisphere it must be mounted with the solar radiation sensor facing North. In addition, the hemisphere
jumper inside the MKIII-MB must be changed from Northern to Southern as shown in the image be in the
wiring section.

WIRING

To enter the enclosure with a cable, the front cover must first be removed. Remove the four Philips head
screws from the back of the enclosure. Once the lid is removed, the circuit board is exposed.

CONNECTING RS-485

The MKIII-MB is supplied with a half-duplex RS-485 serial port. Wiring connections are made using the 4-
pin screw terminal inside of the MKIII-MB electronics enclosure. Cable is not supplied with the unit. The RS-
485 lines can be terminated with a 120-ohm resistor. This can be enabled by moving the termination
jumper, located inside the unit, to the "ON" position. This requires removing the enclosure cover.
RS-485 TERMINALS
A (-):
B (+):
GND:
+VDC:
RS-485 is rated to 4,000 feet (1,200 m) at 90 kbps. The RS-485 port on the MKIII-MB is surge protected but
not isolated.

CONNECTING THE POWER SUPPLY

The weather station must be powered by an external power source unless the solar-powered option has
been purchased. For systems running with external power, a cable connection must be made between the
RS-485 interface board and the motherboard. A cable is provided and should already be connected to J2
on the RS-485 board.
Negative RS-485
Positive RS-485
Signal/Power Ground
External 10-30VDC Supply
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