Gill Instruments Ltd
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WindObserver II Pipe Mount
Page 10
Issue 04
Doc. No. 1390-PS-0009
August 2009
6.4 . Connections
Important
Do NOT join any of the cores of the cable together. Joining cores
could damage the unit permanently. Any cores not used should be isolated.
Do NOT connect the unit’s 0V, heating –ve or digital 0V to the screen or earth.
The screens of each pair are joined together inside the anemometer - these should be
joined to the cable screen(s) of any further cable run. Avoid long grounding loops. Digital
OV should be used in conjunction with RS422 TX RX lines in order to improve noise
immunity.
Conductor colour
Designation
Pair 1
green
RS422_TXB (+)
black
RS422_TXA (-)
Pair 2
white
RS422_RXB (+)
black
RS422_RXA (-)
Pair 3
red
Supply V+
black
Supply V-
Pair 4
blue
Digital 0v
black
Not used (isolate)
Pair 5
yellow
black
Heater –
Pair 5
brown
black
Heater –
Screens
Chassis ground
Earthing or grounding
To ensure correct operation, and for maximum protection against lightning, the
anemometer
MUST
be correctly earthed (grounded) via its mountings. Inadequate
Earthing will degrade anemometer performance, particularly in the presence of radio
frequency interference.
The unit
MUST
be connected to an appropriate grounding point with a minimum of 6mm²
copper wire, via the M8 base screw. The cable screens must be joined with any cable
screen continuing from the unit’s cable via a junction box. The primary earth for the
anemometer must be provided via the base screws and not via the cable screens. See Fig.2.
Factory Default Output Settings
The factory default settings are:
A0 B3 C1 E1 F1 G0000 H2 J1 K1 L1 M2 NA O2 P5 T1 U1 V1 X2 Y1 Z1
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