Campbell Scientific AM16/32B AM16/32B Relay Multiplexer - Page 24
CR1000, CR800, and CR850 Programming
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AM16/32B Relay Multiplexer Units: the unit of time to be used for the SubInterval parameter. A numeric or alphabetical code can be entered. Numeric 0 1 2 3 Alpha μsec msec sec min Description microseconds milliseconds seconds minutes Count: the number of times the SubScan() will run each time the scan runs. Basically, the count parameter is the number of sets on the multiplexer that you will be using for this SubScan() instruction. For example, if your instruction is SubScan(0,μSec,7) and you are in the in 2x32 mode, this instruction will measure the first seven differential ports (numbers in white) on the multiplexer. If you are in the 4x16 mode, this instruction will measure the first seven sets of four on the multiplexer (numbers in blue). It may be desirable to use the repetition parameter of your measurement instructions that are between SubScan() and NextSubScan. The repetitions parameter is the number of sensors per instruction that you will be measuring. For example, if you are using the 2x32 mode and the program contains the following: SubScan(1,μSec,7) VoltDiff (Dest,1,mV5000,1,True,0,250,1.0,0) NextSubScan You will be making one measurement per differential instruction because the differential instruction has a repetition parameter of 1. A total of seven differential sensors are measured because the count parameter of the SubScan() instruction is 7. In the 4x16 mode, if the program contains the following: SubScan(1,μSec,7) VoltDiff (Dest,2,mV5000,1,True,0,250,1.0,0) NextSubScan You will be measuring two differential sensors per subscan because the differential instruction has a repetition parameter of 2. A total of 14 differential sensors will be measured because the count parameter of the SubScan() instruction is 7 (i.e., 2 measurement per subscan x 7 subscans =14). 5.1.1 CR1000, CR800, and CR850 Programming Although the following example is a CR1000 program, a similar program can be used for the CR800 or CR850. This CR1000 program uses the AM16/32B to measure 48 CS616 probes connected in the 4x16 configuration. The program also measures datalogger battery voltage and temperature. 14