Gill Instruments Ltd
Intrinsically Safe WindObserver Anemometer
Page 25
Issue 10
Doc. No. 1360-PS-0001
May 2015
7.
CONNECTION TO A PC OR OTHER DEVICE
Connection to a PC or other device requires the use of:
1) The specified Intrinsically Safe Power Supply Unit Interface – MUST BE USED
UNDER ALL CIRCUMSTANCES, CERTIFICATION DEPENDS UPON THIS.
2) Power Supply Interface to PC / Other device cable – e.g. Digital RS232 9 way “D
Type” connector.
The IS Power Supply Unit supplies power to the anemometer electronics and provides
conversion of the RS422 signal sent by the anemometer to a RS422 or RS232 signal for a
PC. An RS422 or RS232 to USB converter may be required to interface with some PC’s.
The anemometer outputs wind data through a single 20 way circular connector in the
base. Details of the pin allocations can be found on Page 20. Data is provided in Digital
format.
Connecting to a PC or External Device using the RS422 Output
Maximum suggested RS422 approved twisted pair screened cable length is 1000 Metres.
Intrinsically Safe
Power Supply Box
PC or Device with
RS422 Input
Signal
Name
Mains PSU
Terminal
Low Voltage
PSU J4
Terminal
Signal Name
TX +
3
3
RX+
TX -
4
4
RX-
GND
5
5
Ground Earth
RX +
1
1
TX +
RX -
2
2
TX -
Connecting to a PC or External Device using the RS232 Output
Maximum suggested RS232 approved screened cable length is 25 Metres.
Intrinsically Safe
Power Supply Box
PC 9 way Connector
Serial Port Input
RS232
Signal
Name
Mains PSU
Terminal
Low Voltage
PSU J2
Terminal
Terminal Number
RXD
11
3
2
TXD
12
5
3
GND
14
9
5 (GND)
Cable Shield Wire
Cable Shield Wire
