Vaisala WINDCAP WS425 Guide de l'utilisateur télécharger pdf (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

1 2 ... 52 53 54 55 56 57 58 59 60 61 62 ... 90 91

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Vaisala WINDCAP WS425 Guide de l'utilisateur Page 57