WindMaster and WindMaster Pro
1561-PS-0001.
Issue 11 February 2017
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26
6.10.
Using RS485, 2 Wire, WindMaster/WindMaster Pro Networking
Notes:-
1.
These notes apply to using WindMasters and WindMaster Pro’s only on a 2 wire RS485 network.
2.
Set up the WindMaster operating configuration before wiring for RS485 mode.
3.
WindMasters
must
be configured for RS485 by linking Comms Mode line (Pin 4) to 0V (Pin 12).
4.
On Pipe Mount box units set J4 Link to COM/CM and externally link Comms mode to Power V+ or internally
move link from J4 COM/CM to between COM and V+.
5.
On non pipe mount box units if Pin 4 is left open circuit the unit will default to RS422 operation in Auto mode.
6.
WindMasters
must
be in a Polled mode.
7.
The baud rate setting may need to be adjusted/increased to 38400 or above depending on the poll rate.
8.
The Master unit can be any suitable control device fitted with a RS485 interface card, such as a PC or Data
logger. For best operation then the units should be connected directly to an RS485 interface card, use of some
converters may degrade operation.
9.
Analogue Outputs are also simultaneously available.
10.
Node IDs of A-F, K, M, N or P are not recommended to use in a multi-drop system as these letters may appear
in the WindMaster data string.
11.
See Para 7.3 for more details on Poll operation.
WindMaster connector
Master
E.g. PC with RS485 card
Signal names
Pipe Mount Box
31 way
Pin nos.
Cable –twisted
pairs
Signal names
TXB(+)
RXB(+)
J2, TXB(+)
J2, RXB(+)
2
5
T/RX(+)
TXA(-)
RXA(-)
J2, TXA(-)
J2, RXA(-)
1
6
T/RX(-)
Signal Ground
Screen (Use the
most convenient
pin)
Screen Ground
3, 7, 21,
30 or 31
Screen and
drain wires
Chassis ground
Comms Mode
- link to Power 0V)
J4, Move link to
between COM to 0V
4
Power +ve
J1, PWR V+
11
+ DC Power Supply
Power 0v
J1, PWR 0v
12
- 9-30v
