Error Handling, 166 | Agilent Technologies 66309B, D, 66311B, 66111A

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 66111A, 66309B, 66311B, D specifications

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Error Handling

Example 1. National Instruments Interface Example

1040 CALL IBCLR(PS%)

IOUT = OUTPUT(2)

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

166

66111A, 66309B, 66311B, D specifications