WindSonic Doc No 1405 PS 0019 Issue 28 November 2019
23
7.9 Using RS485 (2 wire point to point) with Option 2 or 3
units
Notes
1.
The unit must be set for RS422/485 mode (E2 setting).
2.
WindSonics must be set in Polled mode
, a node address letter may be given if
required.
See Section 9.1 WindSonic node address.
3.
Customers may poll using terminal software (NOT supplied).
4.
As unit is point to point only it cannot be networked with other RS485 2 wire devices.
WindSonic
9 Way circular connector
PC with RS485 card
Signal names
Pin
nos.
Cable – 3 twisted pairs
Signal names
TXD+
RXD+
4
6
T/RXD +
TXD –
RXD –
5
7
T/RXD –
Signal Ground
1
Signal Ground
Do NOT connect
at this end
N/A
Screen and drain wires
Chassis ground
V
V supply -
2
3
+
–
DC Power supply
(See Para 7.3.2)
NOTE:
Analogue Outputs are also simultaneously available from the Option 3 unit.
