Campbell CR5000 Spécifications télécharger pdf (Page 152)

Section 7. Measurement Instructions

7-26

SW12

The SW12 instruction is used to set a Switched 12 volt supply high or low.

Syntax

SW12( State )

Remarks

The datalogger has a switched 12 volt output with two terminals. This switched

12 volts is used to provide a continuous 12 volt supply to external peripherals.

At room temperature the switched 12 volt supply can source 900 mA between

the SW-12 terminal and Ground. The State parameter indicates whether the

switched 12 volts is High (non-zero) or low (0).

The SW-12 supply is unregulated and can supply up to 900 mA

at 20C and up to 630 mA at 50C. A resettable polymeric fuse

protects against over-current. Reset is accomplished by removing

the load or turning off the SW-12 for several seconds.

SW12 Example

This example sets the switched 12 volt supply high at the beginning of each

scan, and low at the end of the program.

Const RATE = 500 'Scan interval number

Const RUNITS = 1 'Scan interval units (mSecs)

Const TBLINT1 = 200 'Table 1 interval number

Const UNITS1 = 1 'Table 1 interval units (mSecs)

Dim Tblk1( 1 ) 'Block #1 dimensioned source

Dim Tref 'Declare reference temperature variable

Public Flag( 8 ) 'Flag dimension

DataTable( TEST, Flag( 1 ), 1000 ) 'Trigger, buffer of 1000 Records

DataInterval( 0, TBLINT1, UNITS1, 100 ) '200 mSecs, 100 lapses

Average( 1, Tblk1(), FP2, 0 ) 'Reps,Source,Res,Disable

EndTable 'End of table TEST

BeginProg 'Program begins here

Scan( RATE, RUNITS, 1, 0 ) 'Scan 500 (mSecs), no fast buffer

SW12( 1 ) 'Set SW12 high

PanelTemp( Tref., Integ ) 'PanelTemp

TCDiff( Tblk1(), 1, 1, 1, 1, Tref, 0, 20, 40, 1.8, 32 )

CallTable TEST 'Run Table TEST

SW12 ( 0 ) 'Set SW12 log

Next Scan 'Loop up for the next scan

EndProg 'Program ends here

NOTE

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Campbell CR5000 Spécifications Page 152