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SDM-SW8A Switch Closure Input Module
5.2 Measurement Jumpers
Near each input channel is a jumper triplet used to configure the channel for
the measurement type. The SDM-SW8A is shipped from the factory with each
channel configured for DC Voltage pulse. An example of each configuration
is illustrated in Figure 2. Table 4 shows jumper pins and the corresponding
measurement type.
TABLE 4. Measurement Jumpers
Measurement Type Pins
Jumpered
SPDT Switch Closure 1 and 6
SPST Switch Cl. or Open Coll. 2 and 5
Voltage Pulse 3 and 4
6. Datalogger Programming
6.1 CRBasic Programming
The SW8A instruction is used to control the SDM-SW8A Eight-Channel
Switch Closure module, and store the results of its measurements to a variable
array.
Parameter
& Data Type
Enter
Dest
Variable or
Array
The variable in which to store the results of the SW8A measurement. The
variable array for this parameter must be dimensioned to the number of
Reps.
Reps
Constant
The number of channels that will be read on the SW8A. If (StartChan
+Reps –1) is greater than 8, measurement will continue on the next
sequential SW8A. In this instance, the addresses of the SDM devices must
be consecutive.
SDMAddress
Constant
The address of the first SW8A with which to communicate. Valid SDM
addresses are 0 through 15. If the SDMTrigger instruction is used in the
program, address 15 should not be used. If the Reps parameter used more
channels than are available on the first SW8A, the datalogger will increment
the SDM address for each subsequent device that it communicates with.
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