Campbell Scientific CR9000X Measurement and Control System - Manual (Page 243)

Section 7. Measurement Instructions
7-19
CSAT3 (Dest, Reps, Address, Command)
Communicates with the CSAT3 three dimensional sonic anemometer. See
CSAT3 manual for more information.
This instruction cannot be used in a SubScan.
SDMAO4 (Source, Reps, SDMAddress)
This instruction is used to set the voltage on a SDM-AO4 four channel analog
output device. The SDM-AO4 can supply -5000 to +5000 mVolts with a
compliance current of about 1 mAmp (see SDM-AO4 manual for details). The
Source value should be scaled to values from -5000 to +5000 in order to use
the full voltage range available. If the Source value is above (below) 5000 (-
5000), the SDM-AO4's corresponding channel voltage will be set to +5000
mV (-5000 mV).
Parameter
& Data Type Enter SDMA04 PARAMETERS
Source
Variable or
Array
The Source parameter is a variable array that holds the values for the
voltages (millivolts) that will be output by each channel of the device
(Source(1) sets channel1, Source(2) sets channel2, etc.).This parameter must
be an array dimensioned to the size of the Reps.
Reps
Constant The Reps parameter determines the number of SDM-AO4 output channles
that will be set using this instruction. If this parameter is greater than four
(i.e., voltage is being set for more than one SDM-AO4 device), values will
be sent to the next consecutively addressed SDM-AO4 device. In this case,
the SDM-AO4s must have sequential SDM addresses.
SDMAddress
Constant
The SDMAddress parameter defines the address of the SDM-AO4 that the
instruction will set. Valid SDM addresses are 0 through 14. Address 15 is
reserved for the SDMTrigger instruction.
This instruction cannot be used in a SubScan.
SDMCAN (Dest, SDMAddress, TimeQuanta, TSEG1, TSEG2, ID, DataType,
StartBit, NumBits, NumVals, Multiplier, Offset)
The SDMCAN instruction is used to measure and control the SDM-CAN
interface.
SDMCAN instructions for a “specific” SDM address must all
use the same TimeQuanta, TSeg1 and TSeg2 bit timing
parameters. CAN identifiers for a “specific” SDM-CAN must
all be 11bit or 29bit (cannot mix identifier types).
Multiple SDMCAN instructions may be used within a program. At datalogger
program compile time, the details of each instance of the instruction are sent to
each SDM-CAN as a configuration file. In the subsequent run-time
encounters of each instruction, data is transferred between the datalogger and
the SDM-CAN(s).
NOTE
NOTE
NOTE