Campbell Hausfeld SDM-CVO4 Manual Do Utilizador

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.  

CVO4Mode 

The CVO4Mode determines what type of signal will be output by 
the device.  The options are: 

 

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 in 
the device.  Use of this mode takes approximately 2 milliseconds 
additional time per device.  When either of these options is used 
you lose the flexibility of setting the output mode for each 
channel individually.  Additionally, subsequent programs sent to 
the datalogger must also use an override mode or the power must