Vaisala WS425FG - Manual (Page 49)

Chapter 4 ________________________________________________________________ Operation
VAISALA_______________________________________________________________________ 47
WD Command
This command reports the status of the BITs. The command format is:
WD CR LF
The command is intended to be sent by the host system to get a concise
report on the pass/fail status of all Built-In Tests. The response is the
following:
STX WD PPPPPPPPPPPP CS ETX CR LF
For a complete order, description and test limits for each pass/fail status
reported, see section
WS Command on page 45 .
WF Command
The command format is:
WF CR LF
The WF command returns a fixed pattern of data. This command is
typically used to verify the communications link. The data fields are
fixed at the following values:
where
STX
= ASCII start of test control character (position 1)
WD = command identifier (positions 2,3)
P or F = Pass/Fail for 12 built in tests specified in WS command
above in the order shown in the WS command text
(positions 4-15).
CS modulo 256 hexadecimal checksum of all characters from
position 2 through the last P or F (positions 16,17)
ETX ASCII end of text control character (position 18)
CR ASCII carriage return control character (position 19)
LF ASCII line feed control character (position 20)
Status = F
Wind direction = 678