Campbell Scientific SDM SDM-SW8A 8-Channel Switch Closure Input Module - Page 10

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 SPDT Switch Closure SPST Switch Cl. or Open Coll. Voltage Pulse Pins Jumpered 1 and 6 2 and 5 3 and 4 6. Datalogger Programming The datalogger is programmed using either CRBasic or Edlog. Dataloggers that use CRBasic include our CR800, CR850, CR1000, CR3000, and CR5000. Dataloggers that use Edlog include our CR7, CR10(X), CR23X, and 21X. Both CRBasic and Edlog are provided in PC400 and LoggerNet datalogger support software. 6.1 CRBasic Programming 6.1.1 SDMSW8A Instruction The SDMSW8A 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 Dest Variable or Array Reps Constant SDMAddress Constant Enter 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. 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. 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. 6