Rs-232 operation using turbo c – Agilent Technologies 34401A User Manual

Page 199

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

#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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Continued on next page

Chapter 6 Application Programs
RS-232 Operation Using Turbo C

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