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RS-232 Operation Using Turbo C

The following example shows how to program an AT personal computer

for interrupt-driven

COM port communications. SCPI commands can be

sent to the Agilent 34401A and responses received for commands that

query information. The following program is written in Turbo C and can

be easily modified for use with Microsoft

Quick C.

#include <bios.h>

#include <stdio.h>

#include <string.h>

#include <dos.h>

#include <conio.h>

#define EVEN_7 (0x18 | 0x02 | 0x04) /* Even parity, 7 data, 2 stop */

#define ODD_7 (0x08 | 0x02 | 0x04) /* Odd parity, 7 data, 2 stop */

#define NONE_8 (0x00 | 0x03 | 0x04) /* None parity, 8 data, 2 stop */

#define BAUD300 0x40

#define BAUD600 0x60

#define BAUD1200 0x80

#define BAUD2400 0xA0

#define BAUD4800 0xC0

#define BAUD9600 0xE0

/* 8250 UART Registers */

#define COM 0x3F8 /* COM1 base port address */

#define THR COM+0 /* LCR bit 7 = 0 */

#define RDR COM+0 /* LCR bit 7 = 0 */

#define IER COM+1 /* LCR bit 7 = 0 */

#define IIR COM+2 /* The rest are don’t care for bit 7 */

#define LCR COM+3

#define MCR COM+4

#define LSR COM+5

#define MSR COM+6

RS-232 Operation Using Turbo C

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Chapter 6 Application Programs

RS-232 Operation Using Turbo C

193

Agilent Technologies 34401A User Manual

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