User`s guide

Chapter 5 ______________________________ Operating WMT700 with WS425 and SDI-12 profiles

VAISALA _______________________________________________________________________ 57

WMT700 responds to the Wx command with a 19-character fixed-length

data message. For more information, see Table 19 below.

Table 19 WS425 A/B ASCII Data Message

Character Description

1 ┐ 02H (<STX>, start of transmission)

2 W

3 Averaging in seconds.

4 Status:

P = pass

F = fail

5 Wind direction (most significant digit)

6 Wind direction (middle digit)

7 Wind direction (least significant digit)

8 Wind speed (most significant digit)

9 Wind speed (next digit)

10 Wind speed (next digit)

11 Wind speed (least significant digit)

12 . (dot character)

13 Wind speed (tenth digit)

14 Wind speed unit:

M = miles per hour

K= knots

L = kilometers per hour

T = meters per second

15 Checksum (most significant digit). For more information, see the

note below.

16 Checksum (least significant digit)

17 └ 03H (<ETX>, end of transmission)

18 CR (carriage return)

19 LF (line feed)

NOTE

The checksum is calculated from the characters from position 2 to 14.

The accumulator initializes at 0 with the addition of the byte value. The

checksum has a range of 0H … FFH.

Example of the command and response:



W5P1200013.2TDE