Campbell-scientific TDRSDK Software Developement Kit Bedienungsanleitung PDF herunterladen (Seite 21)

A-1

Appendix A. TDR100 Command

Protocol

:XXXX ffffffffHLcr Type 1 commands to set a variable (space between

command and value)

:XXXXHLcr Type 2 & 3 commands

: Start of Command

XXXX Command ASCII Characters

ffffffff Floating point number in ASCII characters preceded by a

space. No maximum number of characters, a single

floating point value.

HL Hexadecimal representation of 8 bit Checksum which

includes all characters after ‘:’ and before the checksum.

Computed by summing each character and discarding any

carries.

H = high order bits, L = low order bits.

cr Carriage Return

:XXXX One of the following 4 character commands.

Type 1 Commands (Set a variable)

:S_VP n Set Vp value

:SDIS n Set Distance (Cable Length)

:SMAX n Set maximum display value

:SMIN n Set minimum display value

:SMUX n Set SDMX50 channel

:SNAV n Set Number of Averages

:SPCC n Set Probe Cell Constant

:SPNT n Set Number of Points

:SPRL n Set Probe Length

:SPRO n Set Probe Offset

:SSMO n Set Smooth Value

:SWLN n Set Window Length

:CCCC n Calculate Cell Constant (special type-1 cmd that returns

value like type-2 cmd)

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Campbell-scientific TDRSDK Software Developement Kit Bedienungsanleitung Seite 21