WindSonic GILL, User Manual, Page: 16 / 35

WindSonic Doc No 1405 PS 0019 Issue 25 February 2017
30
9.2 Gill format – UV, Continuous
In this mode, the output is given as signed (i.e. positive or negative) speeds along the
‘U’ (= South – North) axis and the ‘V’ (= East – West) axis.
Where:
<STX> = Start of string character (ASCII value 2)
WindSonic node address = Unit identifier
U axis = speed & polarity
V axis = speed & polarity
Units = Units of measure (knots, m/s etc.)
Status = Anemometer status code ( see Section 11.5
for further details)
<ETX> = End of string character (ASCII value 3)
Checksum = This is the EXCLUSIVE – OR of the bytes
between (and not including) the <STX>
and <ETX> characters
The WindSonic unit identifier, Units, and Checksum are as described in Section 0 above.
Figure 5 shows the polarity of U and V if the wind components along the U and V axis are
blowing in the direction of the respective arrows.
Figure 5 UV Polarity
<STX>Q, +001.59, - 002.74, M, 00, <ETX> 2D
WindSonic
node
address
U axis
speed and
polarity
V axis
speed and
polarity
Units Status
Check
sum
WindSonic Doc No 1405 PS 0019 Issue 25 February 2017
31
9.3 Gill format – Polled (Polar or UV)
When in the Polled mode, an output is only generated when the host system sends a Poll
signal to the WindSonic consisting of the WindSonic Unit Identifier – that is, the relevant
letter A – Z.
The output formats are otherwise as described in Sections 9.1 and 9.2.
The commands available in this mode are:
Description Command WindSonic response
WindSonic Unit Identifier A ….. Z Wind speed output generated
Enable Polled mode ? (None)
Disable Polled mode ! (None)
Request WindSonic Unit Identifier ? & A ….. Z (as configured)
Enter Configuration mode *<N> CONFIGURATION MODE
Where <N> is the unit identifier, it is recommended that ID’s A to F and KMNP are not used
as these characters can be present in the data string.
Notes: -
It is suggested that in polled mode the following sequence is used for every poll for
information.
? Ensures that the Sensor is enabled to cover the event that a power down has occurred.
A-Z Appropriate unit designator sent to retrieve a line of data.
! Sent to disable poll mode and reduce possibility of erroneous poll generation.
When in polled mode the system will respond to the data command within 130mS with the
last valid data sample as calculated by the Output rate (P Mode Setting).
If the unit is powered down after use or upon switch on then allow 5 seconds from switch on
before sending poll commands.
Polled mode can only be used for point to point communications. It is not possible to
network units on a common bus.