Vaisala WS425FG - Manual (Page 57)

Chapter 4 ________________________________________________________________ Operation
VAISALA_______________________________________________________________________ 55
The array heater resistance value will be missing (99.) if either the
heater on voltage is below 10 V RMS or the array heater on current is
below 1 A RMS.
WSST Command
This command returns the static speed of sound and sonic temperature.
The command format is:
WSST CR LF
The command responds with a return string containing the measured
static speed of sound in knots with a tenth of a knot resolution, followed
by an ASCII TAB control character, then the corresponding sonic
temperature in degrees Fahrenheit with a tenth of a degree resolution.
The return string is terminated with an ASCII carriage return and then
line feed character. No descriptive text is included. The sonic
temperature is not compensated for the effects of humidity on the static
speed of sound. The static speed of sound output is a ten second running
average of individual static speed of sound measurements calculated
each second. The sensor calculates a new sonic temperature from this
running average of static speed of sound each second. The sensor
Bytes 45-46: XX format path 1 Signal Quality Index
Byte 47: P or F for path 2 Signal Quality Index pass or fail
Bytes 48-49: XX format path 2 Signal Quality Index
Byte 50: P or F for path 3 Signal Quality Index pass or fail
Bytes 51-52: XX format path 3 Signal Quality Index
Byte 53: P or F for path 4 Signal Quality Index pass or fail
Bytes 54-55: XX format path 4 Signal Quality Index
Byte 56: P or F for path 5 Signal Quality Index pass or fail
Bytes 57-58: XX format path 5 Signal Quality Index
Bytes 59-60: XX hexadecimal ASCII for modulo 256 checksum
for
Character positions 2 through 58
Byte 61: ETX end of text ASCII control character
Byte 62: ASCII carriage return control character
Byte 63: ASCII line feed control character