Vaisala WS425 - Manual (Page 42)

USER'S GUIDE____________________________________________________________________
42 __________________________________________________________________ M210361EN-E
Table 10 The RS-232 19-character Fixed Length Output
Message
Character
position Message
1 “ ☻” 02H (<STX>, start of transmission)
2 “W”
3
“5” for 5-second running average
4 “P” for “pass”
“F” for “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 “M” for miles per hour; “K” for knots
“L” for kilometers per hour; “T” for meters per second
15 Check sum (most significant digit) (See note)
16 Check sum (least significant digit)
17 “ ♥” 03H (<ETX>, end of transmission)
18 [CR] (carriage return)
19 [LF] (line feed)
NOTE The checksum is calculated from 13 characters from position 2 through
14. The accumulator initializes at 0 with the addition of the byte value.
The checksum has a range of 0H … FFH.
Missing Readings
If data is missing due to a measurement problem, Handar RS-232
message reports 999.9 for wind speed.
NOTE The sensor has a 20 ms timeout in receiving characters. Therefore,
polling strings should be transmitted by a programmable device, not as a
user command via terminal sessions.