Cutler-Hammer D50 - Page 181

168 D50 PLC User's Manual
void main(void)
{
unsigned int i;
/* Selection of communication port */
clrscr();
printf("PORT : COM1[1]/ COM[2]/ GPC-232[3]/GPC-485[4]/ GPC-Parallel[5] = ");
scanf("%d",&port_number);
if ((port_number < 1) || (port_number > 5)) port_number=5;
/* Selection of Baudrate for Serial communication */
sending_delay=10;
if (port_number != 5)
{
printf("GPC «å BAUD-RATE : 9600[1]/ 4800[2]/ 2400[3] = ");
scanf("%d",&i);
if ((i < 1) || (i > 3)) i=1;
if (i == 3) i=4;
if ((port_number == 1) || (port_number == 2)) DIVISOR=12 * i;
else DIVISOR=40 * i;
receiving_delay=3 * i + 1;
}
/* Initialization of GPC card */
if(port_number == 1) PORTADD=0x3F0;
if(port_number == 2) PORTADD=0x2F0;
if ((port_number >= 3) && (port_number <=5))
{
PORTADD=0x300;
outportb(0x303,0xC0);/* Mode=2 of 8255 */
outportb(0x303,0x05);/* PC2=1 of 8255 :Disable IRQ2 */
outportb(0x301,0xFF);/* PB0=1 of 8255 :sending Enable RS-485*/
outportb(0x303,0x01);/* PC0=1 of 8255 :Serial Input Enable*/
if(port_number == 3) outportb(0x303,0x02);/* PC1=0 of 8255 :Select RS-232 */
if(port_number == 4) outportb(0x303,0x03);/* PC1=1 of 8255 :Select RS-485 */
if(port_number == 5) outportb(0x303,0x00);/* PC0=0 of 8255 :Disable SerialInput*/
}
else outportb(PORTADD+0x09,(inportb(PORTADD+0x09)&0xF0));/*Disable
Interrupt*/
/* Initialization of USART-Chip : 8250 */
if (port_number != 5)
{
outportb(PORTADD+0x0B,0x80);/* Set of DLAB=1 */
outportb(PORTADD+0x09,0x00);/* Set of High Byte DIVISOR */
outportb(PORTADD+0x08,DIVISOR);/* Set of Low Byte DIVISOR */
outportb(PORTADD+0x0B,0x03); /* parity=None/Stop=1/ Length=8 */
}
/* Processing communication of Read & Write */
for( ; ; )
{
1. Adjusts the initial communication
port and the board rate for
communication. Then initializes the
variables.
2. Using the communication function
codes, reads the data of the M field,
reads the word values of the M0 to
M127 area and stores them in the K0
to K127 word area. The K registers
are the retentive registers.
3. Uses the communication code to
read the data of the K area.
4. Compares the values of the M area
and the values of the K area, and
indicates OK when the values are the
same.
Beginning of the main program
Select the port of the peripheral
device for the communication:
Serial 9 PIN, 25PIN
Parallel GPU-300 parallel
port
Select board rate:
9600 bps (max)
4800 bps
2400 bps
Set the communication environment
(delay time) for the selected ports.
GPC-300 card Setting (8255chip
setting):
Uses the communication card that is
connected, and sets the environment
according to the PLC communication
spec., so that communication is
possible. Not currently offered by
Cutler Hammer.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com