WindSonic Doc No 1405 PS 0019 Issue 25 February 2017
18
Cable length
The maximum cable length is dependent on the chosen communication format (RS232,
RS422 or RS485 (point to point), the baud rate, and, to a lesser extent, on the cable type and
the local electrical ‘noise’ level.
The table shows the typical maximum lengths at the given baud rates, using the
recommended cable. If any problems of data corruption etc. are experienced, then a slower
baud rate should be used. Alternatively, a thicker or higher specification cable can be tried.
WindSonic
Option
Communication format
Baud rate
Max. cable length
Option 1, 2 and 3
RS232
9600
6.5 m (20 ft)
Option 2 and 3
RS422 or RS485 point to
point
9600
1 km (3200 ft)
Option 3
Analogue – Voltage o/p
N/A
6.5 m (20 ft)
Analogue – Current o/p
N/A
Resistance dependent
(max 300 Ω)
7.3.2 Power supply
WindSonic Option 1 and 2 Units; Require a DC supply of between 5V – 30 V DC (30V DC
max).
WindSonic Option 3 Units;
Require a DC supply of between 7V– 30 V DC (30V DC
max).
WindSonic current drain depends on variant i.e. Option 1, RS232 approximately 9mA at 12v
dc rising to 44mA for Analogue variant.
Lowest power consumption is obtained with the following configuration: -
M2, P20, B3, S9 (approximately 5.5mA at 12v).
WindSonic 75 Option 1, 2 and 3 Units;
Require a DC supply of between 12V – 30 V
DC (30V DC max).
WindSonic 75 Option 1 and 2 current drain is typically approximately 13mA at 12v dc.
WindSonic Doc No 1405 PS 0019 Issue 25 February 2017
19
7.4 Connecting to a PC using RS232 (Option 1 Sensor)
Notes
1.
The cable length for reliable operation is limited to 6.5m (20ft).
(
See
Section 7.3.1 Cable length.)
2.
For longer cable runs, we recommend using the WindSonic configured with RS422
output, and a RS422/232 converter at the PC.
3.
Wiring connections below are not applicable to WindSonic Options 2 and 3 set for
RS232 operation.
WindSonic
9 Way circular connector
Typical PC or RS232 to USB
Converter Serial Port
9 Way ‘D’ Connector
Signal names
Pin nos.
Cable – 3 twisted
pairs
Signal names
Pin no's
TXD
RXD
5
7
RXD
TXD
2
3
Signal
Ground
1
Signal Ground
5
Do NOT
connect
at this end
N/A
Screen and drain
wires
Chassis
ground
N/A
V supply -
V
2
3
–
+
DC Power supply
(See Para 7.3.2)
Default Settings
The WindSonic Option 1
unit is factory configured with the following default settings:
M2, U1, O1, L1, P1, B3, H1, NQ, F1, E3, T1, S4, C2, G0, K50,