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aXCncccccccc!
aCoeff(n): cccccccc<CR><LF> write the new coefficient n
value
Extended Command Descriptions
Sensor Board Power Control: aXSc!
This command is necessary when sending commands to daisy chained boards in probes of 4 or
more segments. Replace c with
the character ‘0’ or ‘A’. Use c =
‘A’ to turn power on, use c = ‘0’
to turn power off. Note: Power is automatically turned off after any measurement command.
aXSc!
aA ON<CR><LF> or c=A
aOFF<CR><LF> for c=0
write the new power setting
Read/Write Operating Mode Setting: aXMn!
This command is used to adjust the operating mode of the sensor. The mode setting is non-
volatile, and only needs to be set once. Currently there are only two supported operating
modes, “0” and “1”:
Mode 0:
Default Operating Mode, no special actions taken.
Mode 1:
Enable application of third order polynomial to the measurement value.
Mode 1 allows the measured moisture value m to be recalculated by application of a third order
polynomial equation to the original measured value
m
. The new reported value
m’
is given by
the expression:
m' = A * m
3
+ B * m
2
+ C * m + D
The coefficient A, B, C and D are viewed and modified using the aXCn! Command (see below).
The default settings for these coefficients are 0, 0, 1, and 0 respectively so that
m’
= m.
aXM!
aMode: n<CR><LF>
read the current mode setting
aXMn!
aMode: n<CR><LF>
write the new mode setting to n
In probes of 4 or more segments this command must also be issued to the daisy chained board
to change its operating mode. For example, for a sensor with address ‘0’ first issue
0XSA!
to
enable power to the daisy chained board, then send the command
0X1XMn!
where n is ‘0’ or
‘1’
, as desired.
Read/Write Coefficient/Scale Factor Setting: aXCn!
This command is used to read or write the third order calibration coefficients used for calculat-
ing the moisture reading. All coefficients are non-volatile, and only need to be set once. Valid
values for n are the digits
“0” to “9”, and the letters “A” to “
C
”. The value “cccccccc” is the