Measurement-computing Personal488 rev.3.0 For DOS & Windows 3.Xi Uživatelský manuál stáhnout pdf (Strana 98)

II. SOFTWARE GUIDES - 8. Driver488/DRV 8H. Turbo C

Personal488 User’s Manual, Rev. 3.0 II-83

if (st195 & 0x02)

printf(“Illegal Command\n”);

if (st195 & 0x04)

printf(“No Remote\n”);

if (st195 & 0x08)

printf(“Trigger Overrun\n”);

if (st195 & 0x10)

printf(“Failed Selftest\n”);

}

Use of Character Command Language

In order to simplify programming Driver488/DRV with Turbo Pascal 4.0 and Turbo Pascal 6.0, the

following files are provided on the Driver488/DRV program disk in the

\TURBOP40

directory:

•

IEEEIO.PAS:

Communications routines unit for Driver488/DRV.

•

IEEEIO.TPU:

Compiled unit for using Driver488/DRV.

The actual demonstration program is contained in

195DEMO.PAS

The

IEEEIO.PAS

unit contains initialization code that prepares for communication with

Driver488/DRV. It opens the

IeeeOut

and

IeeeIn

files, sets them into “raw mode”, resets

Driver488/DRV with

IOCTL

followed by

Writeln(IeeeOut,’RESET’)

, and enables

NO DATA

AVAILABLE

error detection by

Writeln(IeeeOut,’FILLERROR’)

These and several other declarations and subroutines contained in the

IEEEIO

unit, are further

discussed below:

VAR

Regs: REGISTERS;

IeeeOut, IeeeIn: TEXT;

PROCEDURE IOCTL;

PROCEDURE IOCTLRead(var Command:STRING);

PROCEDURE RawMode(var AFile:TEXT);

PROCEDURE IeeeComplete;

•

Regs

, defined as a

REGISTERS

type in the DOS unit, is a record that is used to pass the

microprocessor registers to and from the MS-DOS and IntrPascal procedures. Each of the

accessible registers is referred to as a component of

Regs

. For example

Regs.AX:=$1234

is the

same as

Regs.AH:=$12;Regs.AL:=$34

•

IeeeOut

and

IeeeIn

are two

TEXT

file variables that are used for writing to, and reading from,

Driver488/DRV, respectively. They are opened by the

IEEEIO

unit initialization code, and closed

IeeeComplete

8I. Turbo Pascal

Topics

•

Use of Character Command Language...................................... II-82

•

Initialization of the System.......................................................... II-83

•

Configuration of the 195 DMM.................................................... II-84

•

Taking Readings............................................................................. II-85

•

Buffer Transfers............................................................................. II-85

•

Interrupt Handling........................................................................ II-86

•

Sample Program............................................................................. II-88

1 2 ... 93 94 95 96 97 98 99 100 101 102 103 ... 399 400

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