Measurement Computing Personal488 rev.3.0 For DOS & Windows 3.Xi - Manual (Page 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
by 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