Example 2. Controller Using Basic, 168

D – Example Programs

BASIC

The BASIC for controllers and BASIC for Windows both provide access to GPIB functions at the operating system level. This makes it unnecessary to have the header files required in front of DOS applications programs. Also, you do not have to be concerned about controller "hangups" as long as your program includes a timeout statement. Because the dc source can be programmed to generate SRQ on errors, your program can use an SRQ service routine for decoding detected errors. The detectable errors are listed in Appendix C.

Example 2. Controller Using BASIC

1000	!Dc source at stand-alone address = 706
1005	OPTION	BASE 1
1010	DIM Codes$[80],Response$[80],Mode$[32]
1015	!
1020	!Program dc source to CV mode with following voltage and current
1025	OUTPUT	706;"VOLTAGE MAX;CURRENT MAX"
1030	!
1035	!Query	dc source outputs and print to screen
1040	OUTPUT	706;"MEASURE:VOLTAGE?;CURRENT?"	!Query output levels
1045	ENTER 706;Vout,Iout
1050	PRINT "The output levels are ";Vout;" Volts and ";Iout" Amps"
1055	!
1060	!Program current triggered level to a value insufficient to maintain
1065	!supply within its CV operating characteristic
1070	OUTPUT	706;"CURR:TRIG MIN"
1075	!
1080	!Set operation status mask to detect mode change from CV to CC
1085	OUTPUT	706;"STAT:OPER:ENAB 1024;PTR 1024"
1090	!
1095	!Enable Status Byte OPER summary bit
1100	OUTPUT	706;"*SRE 128"
1105	!
1110	!Arm trigger circuit and send trigger to dc source
1115	OUTPUT	706;"INITIATE:SEQUENCE1;TRIGGER"
1130	!Poll for interrupt caused by change to CC mode and print to screen
1135	Response=SPOLL(706)
1140	IF NOT	BIT (Response,7) THEN GOTO 1130	!No OPER event to report
1145	OUTPUT	706;"STAT:OPER:EVEN?"	!Query status operation register
1150	ENTER 706;Oevent		!Read back event bit
1155	IF BIT(Oevent,10) THEN PRINT "Supply switched to CC mode."
1160	!
1165	!Clear	status
1170	OUTPUT	706;"*CLS"
1175	!
1180	!Disable output and save present state in location 2
1185	OUTPUT	706;"OUTPUT OFF;*SAV 2"
1190	END

168 66111A, 66309B, 66311B, D specifications

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BASIC

Example 2. Controller Using BASIC

OPTION

BASE 1

OUTPUT

706;"MEASURE:VOLTAGE?;CURRENT?"

OUTPUT

706;"INITIATE:SEQUENCE1;TRIGGER"

OUTPUT

706;"STAT:OPER:EVEN?"

168

66111A, 66309B, 66311B, D specifications