Campbell Scientific SDM-IO16 16-Channel Input/Output Expansion Module - Manual (Page 18)

SDM-IO16 16 Channel Input/Output Expansion Module
TABLE 2. Bit Period Values
Datalogger Default
Bit Period Minimum Allowable
Bit Period Maximum
Bit Period
CR800, CR850 26.04 μsec 8.68 μsec 2.2 msec
CR1000 26.04 μsec 8.68 μsec 2.2 msec
CR3000 26.04 μsec 8.68 μsec 2.2 msec
CR5000 30 μsec 8 μsec 3 msec
The equation used to calculate the bit rate depends on the datalogger used.
The datalogger will round down to the next faster bit rate.
Equation for CR800, CR850, and CR1000:
bit_rate=INT((k*72)/625)*Resolution
Where:
k= the value entered in BitPeriod
Resolution=8.68 microseconds
Equation for CR3000:
bit_rate=INT((k*144)/625)*Resolution
Where:
k= the value entered in BitPeriod
Resolution= 4.34
μsec.
Equation for CR5000:
bit_rate=INT(k*20)*Resolution
Where:
k= the value entered in BitPeriod
Resolution=50 nsec.
6.3 Edlog Programming
Dataloggers that use Edlog include our CR10(X), CR23X, 21X, and CR7.
6.3.1 Instruction 188 (CR10X and CR23X)
Edlog Instruction 188, ‘SDM-IO16’, supports control of the
SDM-IO16. This instruction is included in the latest versions of the operating
systems for the CR10X and CR23X dataloggers. Instruction 188 is specifically
designed to control the SDM-IO16, and takes the following form:
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