Campbell CR800 Specifikace stáhnout pdf (Strana 193)

Section 7. Measurement Instructions

Parameter

& Data Type

Enter

CaptureTrig

Constant,

Variable, or

Expression

This argument is used when the "Capture All Events" output option is used.

When CaptureTrig is true, the INT8 will return the last nnnn events.

Mult, Offset

Constant,

Variable,

Array, or

Expression

A multiplier and offset by which to scale the raw results of the

measurement. See the measurement description for the units of the raw

result; a multiplier of one and an offset of 0 are necessary to output in the

raw units. For example, the TCDiff instruction measures a thermocouple

and outputs temperature in degrees C. A multiplier of 1.8 and an offset of

32 will convert the temperature to degrees F.

SDMIO16 (Dest, Status, Address, Command, Mode Ports 16-13, Mode

Ports 12-9, Mode Ports 8-5, Mode Ports 4-1, Mult, Offset)

The SDMIO16 instruction is used to set up and measure an SDM-IO16 control

port expansion device.

The ports on the SDM-IO16 can be configured for either input or output.

When configured as input, the SDM-IO16 can measure the logical state of

each port, count pulses, and measure the frequency of and determine the duty

cycle of applied signals. The module can also be programmed to generate an

interrupt signal to the datalogger when one or more input signals change state.

When configured as an output, each port can be set to 0 or 5 V by the

datalogger. In addition to being able to drive normal logic level inputs, when

an output is set high a ‘boost’ circuit allows it to source a current of up to 100

mA, allowing direct control of low voltage valves, relays, etc.

Parameter

& Data Type

Enter

Dest

The variable or variable array in which to store the results of the

measurement (Command codes 1 - 69, 91, 92, 99) or the Source value for

the Command Codes (70 - 85, 93 - 98). The variable array for this

parameter must be dimensioned to accommodate the number of values

returned (or sent) by the instruction.

Status

The variable in which to store the result of the command issued by the

instruction. If the command is successful a 0 is returned; otherwise, the

value is incremented by 1 with each failure.

SDMAddress

The SDMAddress parameter defines the address of the SDM-IO16 with

which to communicate. Valid SDM addresses are 0 through 14. Address 15

is reserved for the SDMTrigger instruction. If the Reps parameter is greater

than 1, the datalogger will increment the SDM address for each subsequent

SDM-IO16 that it communicates with.

Note: CRBasic dataloggers use base 10 when addressing SDM devices.

Edlog programmed dataloggers (e.g., CR10X, CR23X) used base 4 for

addressing.

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1 2 ... 188 189 190 191 192 193 194 195 196 197 198 ... 323 324

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