D – Example Programs

Error Handling

If there is no error-handling code in your program, undetected errors can cause unpredictable results. This includes "hanging up" the controller and forcing you to reset the system. National Instruments drivers have routines for detecting program execution errors. Error detection should be used after every call to a subroutine.

Example 1. National Instruments Interface Example

990’---------------------- Merge DECL.BAS here ------------------------

1000 ’DC Source Variable = PS% ; Stand-Alone Address = 706 1005 CODES$=SPACE$(50):MODE$=SPACE$(5):OEVENT$=SPACE$(20)

1010 D$=SPACE$(60):OUTPUT$=SPACE$(40):BDNAME$="PS%"

1015 DIM OUTPUT(2)

1020 ’

1025 ’Set up dc source interface for DOS driver

1030 CALL IBFIND(BDNAME$,PS%)

1035 IF PS%

1040 CALL IBCLR(PS%)

1045 ’

1050 ’Program dc source to CV mode with following voltage and current 1055 CODES$ = "VOLTAGE MAX;CURRENT MAX" :GOSUB 2000

1060 ’

1065 ’Query dc source outputs and print to screen

1070

CODES$ = "MEASURE:VOLTAGE?;CURRENT?"

:GOSUB 2000

:GOSUB 3000

1075

VOUT = OUTPUT(1)

 

 

 

 

 

1080

IOUT = OUTPUT(2)

 

 

 

 

 

1085

PRINT"The programmed levels are "VOUT" Volts and "IOUT" Amps"

1090

’

 

 

 

 

 

1095

’Program triggered current level to value insufficient to maintain

1100

’supply within its CV operating characteristic

 

1105

CODES$ = "CURR:TRIG MIN"

:GOSUB 2000

 

 

1110

’

 

 

 

 

 

1115

’Set operation status mask to detect mode change from CV to CC

1120

CODES$ = "STAT:OPER:ENAB 1024;PTR 1024"

:GOSUB 2000

 

1125

’

 

 

 

 

 

1130

’Enable Status Byte OPER summary bit

 

 

1135

CODES$ = "*SRE 128"

:GOSUB 2000

 

 

1140

’

 

 

 

 

 

1145

’Arm trigger circuit and send trigger to dc source

 

1150

CODES$ = "INITIATE:SEQUENCE1;TRIGGER"

:GOSUB 2000

 

1160

’Wait for supply

to respond to trigger

 

 

1165

FOR I= 1 to 100

:NEXT I

 

 

 

1170

’

 

 

 

 

 

1175

’Poll for interrupt caused by change to CC mode and print to screen

1180

SPOL%=0

 

 

 

 

 

1185

CALL IBRSP(PS%,SPOL%)

 

 

 

 

1190

IF (SPOL% AND 128) = 128 THEN POLL = 1 ’Set interrupt flag on OPER bit

1195

IF POLL <> 1 THEN GOTO 1230

 

’No interrupt to service

1200

"CODES$ = "STAT:OPER:EVEN?"

:GOSUB 2000 ’Query status oper register

1205

CALL IBRD(PS%,OEVENT$)

 

 

’Read back event bit

1210

IF IBSTA%

 

 

 

 

 

1215

OEVENT=VAL(OEVENT$)

 

 

 

 

1220

IF (OEVENT AND 1024) = 1024 THEN PRINT "Supply switched to CC mode."

166

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Agilent Technologies 66309B, D, 66311B, 66111A manual Error Handling, Example 1. National Instruments Interface Example, 166
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66111A, 66309B, 66311B, D specifications

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