Measurement-computing Personal488 rev.3.0 For DOS & Windows 3.Xi Instrukcja Użytkownika Pobierz pdf (Strona 106)

II. SOFTWARE GUIDES - 8. Driver488/DRV 8I. Turbo Pascal

Personal488 User’s Manual, Rev. 3.0 II-91

IF (st195 and 1) 0 THEN Writeln(‘Overflow’);

IF (st195 and 2) 0 THEN Writeln(‘Buffer Full’);

IF (st195 and 4) 0 THEN Writeln(‘Buffer 1/2 Full’);

IF (st195 and 8) 0 THEN Writeln(‘Reading Done’);

IF (st195 and 16) 0 THEN Writeln(‘Busy’)

END ELSE BEGIN {ERROR is set}IF (st195 and 1) 0 THEN

Writeln(‘Illegal Command Option’);

IF (st195 and 2) 0 THEN Writeln(‘Illegal Command’);

IF (st195 and 4) 0 THEN Writeln(‘No Remote’);

IF (st195 and 8) 0 THEN Writeln(‘Trigger Overrun’);

IF (st195 and 16) 0 THEN Writeln(‘Failed Selftest’)

END;

END; {of procedure CheckInt}

Use of Direct DOS I/O Devices

Once Driver488/DRV has been installed in your system, it is ready to begin controlling IEEE 488 bus

devices. To show how this is done, we develop a short program, in the Lotus 1-2-3 macro language, to

control a Keithley Instruments Model 195 digital multimeter. This program should also be compatible

with Symphony, and a very similar Quattro program is also included on the Driver488/DRV program

disk. The techniques used in this program are quite general, and apply to the control of most

instruments.

Initialization of the System

Any program using Driver488/DRV must first establish communications with the Driver488/DRV

software driver. In Lotus 1-2-3 and most other languages this is accomplished using an

OPEN

command:

{OPEN IEEE,W}

Once the file is opened, we can send commands and receive responses from Driver488/DRV. First,

completely reset the Driver488/DRV with the

RESET

command:

{WRITELN RESET}

which resets the operating parameters of the Driver488/DRV back to their normal values (those that

were set during system boot by the

DRVR488

DOS command).

When Lotus 1-2-3 reads from Driver488/DRV it expects that the responses are terminated by a single

carriage return character. As Driver488/DRV normally appends both carriage return and line feed to

its responses, it must be configured to use the correct terminator:

{WRITELN EOL IN CR}

Next, we can enable

SEQUENCE - NO DATA AVAILABLE

error detection by setting the

FILL

mode to

ERROR

{WRITELN FILL ERROR}

8J. Spreadsheets

Topics

• Use of Direct DOS I/O Devices..................................................... II-90

• Initialization of the System.......................................................... II-90

• Configuration of the 195 DMM.................................................... II-91

• Taking Readings............................................................................. II-92

• Interrupt Handling........................................................................ II-92

1 2 ... 101 102 103 104 105 106 107 108 109 110 111 ... 399 400

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