Campbell Scientific SDM-CVO4 4-Channel Current/Voltage Output Module - Manual (Page 18)

SDM-CVO4 4-Channel Current/Voltage Output Module
6.1 CRBasic SDMCVO4 Instruction
This instruction is used to control the SDM-CVO4 four channel
current/voltage output device.
Syntax
SDMCVO4 ( CVO4Source, CVO4Reps, SDMAddress, CVO4Mode )
Remarks
This instruction controls the SDM-CVO4, which outputs a voltage or a current.
Internal jumpers are used to set the mode for the device, but the jumpers can be
overridden with the Mode parameter in this instruction.
CVO4Source The CVO4Source parameter is a variable array that holds the
values for the voltages (millivolts) or currents (microamps)
that will be output by each channel of the device (Source(1)
sets channel1, Source(2) sets channel2, etc.). When outputting
a voltage, the variable must be within the range of 0 to 10,000.
When outputting a current, the variable must be within the
range of 0 to 20,000.
CVO4Reps The CVO4Reps parameter indicates the number of channels to
set to the defined voltage or current. Additional SDM-CVO4
devices can be controlled by one SDMCVO4 instruction by
assigning them consecutive addresses and setting the
CVO4Reps parameter to a value equal to the total number of
channels of all devices (e.g., to set all four channels on two
devices, set the CVO4Reps parameter to 8).
If the CVO4Reps parameter is set to 0, power to the device
will be turned off.
SDMAddress The SDMAddress parameter defines the address of the SDM-
CVO4 which will be affected by this instruction. Valid SDM
addresses are 0 through 14. Address 15 is reserved for the
SDMTrigger instruction.
CRBasic dataloggers use base 10 when addressing SDM devices.
Edlog programmed dataloggers (e.g., CR10X, CR23X) used
base 4 for addressing. NOTE
CVO4Mode The CVO4Mode determines what type of signal will be output
by the device. The options are:
Option Description
0 Voltage output, use jumper settings (scale only)
1 Current output; use jumper settings (scale only)
10 Voltage output; override jumper setting
11 Current output; override jumper setting
The two override options (10 and 11) affect all of the channels
of all of the SDM-CVO4 devices being controlled by this
instruction. These two options override the hardware settings
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