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Issue: 8 (Applies to firmware 2387 6.09 onwards)
Document number: 1390-PS-0039
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 30mS 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 3 seconds from switch on before sending poll
commands.
ASCII format – Tunnel Mode
In this mode, the output is given as signed (i.e. positive or negative) speeds along the
‘U’ (= South – North) axis and direction as a 1 or 0.
Where:
<STX> = Start of string character (ASCII value 2)
Unit Identifier = Letter A to Z (A Default)
U axis = U axis Wind Speed
U axis = U axis Wind Direction Polarity
where 0 (–U vector) is a wind from the North
direction or 1 (+U vector) is a wind from the South direction.
See Section 5.7
STX> A, 001.59, 1, 00, M, <ETX> 2D
speed
polarity
sum
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