Campbell CR800 Specifikace stáhnout pdf (Strana 260)

Section 9. Program Control Instructions

Parameter

& Data Type

Enter

TimNo

Constant,

Variable, or

Expression

An integer number for the timer (e.g., 0, 1, 2, . . .) Use low numbers to

conserve memory; using TimNo 100 will allocate space for 100 timers even

if it is the only timer in the program.

Units

The units in which to return the timer value.

Constant

Alpha

Code

Numeric

Code

Units

USEC 0 microseconds

MSEC 1 milliseconds

SEC 2 seconds

MIN 3 minutes

TimOpt

Constant

The action on the timer. The timer function returns the value of the timer

after the action is performed

Code Result

0 start

1 stop

2 reset and start

3 stop and reset

4 read only

WaitDigTrig (Port, Edge)

The WaitDigTrig instruction can be executed within a Scan/NextScan

sequence or it can be executed outside a scan (most commonly in a

SlowSequence).

When used inside a scan, execution of the scan is paused until WaitDigTrig is

true (that is, the specified control port rises or falls). When the scan starts, the

time stamp will be incremented by the interval specified by the Scan

instruction. This allows a clock source other than the datalogger’s internal

clock to control the timing of the measurements. This outside clock source

could be a GPS clock or the clock of another “master” datalogger where a

logic level line is connected from the clock source to one of the control ports

on the datalogger.

When used outside a scan, WaitDigTrig behaves similarly to a Delay

instruction, though the delay is based on the rising or falling edge of a control

port instead of based on time. In this instance, the WaitDigTrig instruction can

be placed inside an infinite Do/Loop, and the remaining instructions in that

loop will be performed only when WaitDigTrig is true.

The priority for performing the tasks triggered by this instruction will differ

depending upon whether the datalogger is executing its program in pipeline

mode or sequential mode. Refer to section OV 2.3 for additional information.

Note: If the program is running in sequential mode and has a slow sequence

that includes a WaitDigTrig instruction, once triggered, that sequence will not

be able to perform any measurement tasks when the main scan is running. The

slow sequence will pause before its first measurement instruction, until the

main scan is completed, after which it will continue. If the slow sequence

9-20

1 2 ... 255 256 257 258 259 260 261 262 263 264 265 ... 323 324

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