Pro-face PL-5900 Series, User Manual

Page: 123 / 145

Appendices
App-10
PL-5900 Series User Manual
1 CD 1 FG 1 CD 1 FG
2 RD 2 SD 2 RD 2 SD
3 TD 3 RD 3 TD 3 RD
4 DTR 4 RTS 4 DTR 4 RTS
5 GND 5 CTS 5 GND 5 CTS
6 DSR 6 DSR 6 DSR 6 DSR
7 RTS 7 SG 7 RTS 7 SG
8 CTS 8 CD 8 CTS 8 CD
9 RI 20 DTR 9 RI 20 DTR
A.3 Serial Communication
This section explains how to perform serial communications with the
PL.
„ „ „ „ „
RS-232C (COM1/COM2) Cable Connections
<Example 1> <Example 2>
PL Dsub 25-pin PL Dsub 25-pin
„ „ „ „ „
Sample output program
Below is a sample program for sending 1 character from the RS-232C connector.
Because the PL uses an AT-compatible BIOS, the serial communication BIOS (INT
14 h) does not support communications by interrupt. Therefore, install a reception
interrupt function in the application.
#include <stdio.h>
#include <dos.h>
union REGS ir,or;
main( ){
ir.h.ah = 0x00 ; /* Initialization */
ir.h.al = 0xe3 ; /* 9600bps,8bit,NONE,1stop */
ir.x.dx = 0 ; /* COM1 */
int86 (0x14,&ir,&or) ;
ir.h.ah = 0x01 ; /* 1 character output */
ir.h.al = 0x32 ; /* ‘2’ */
ir.x.dx = 0 ; /* COM1 */
int86 (0x14,&ir,&or) ;
}
Changing commands or parameters also changes function (mode setting, data re-
ception, etc.).