Unitech PT630, Programming Reference Manual

Page: 52 / 73

PT630 Programming Reference Guide Page 52 of 59
------------------------------------------------------------------------------------------------------------------
1.8 COM1 RS232 Control Functions ( INT 33H )
1.8.1 Set Communication Parameters
Entry Parameter: AH = 0
AL bits 7-4: 0001xxxx baud 150
0010xxxx baud 300
0011xxxx baud 600
0100xxxx baud 1200
0101xxxx baud 2400
0110xxxx baud 4800
0111xxxx baud 9600
1000xxxx baud 19200
1001xxxx baud 38400
1010xxxx baud 57600
bits 3-2: xxxx00xx none parity
xxxx01xx odd parity
xxxx11xx even parity
bit 1: xxxxxx0x one stop bit
xxxxxx1x two stop bits
bit 0: xxxxxxx0 7 data bits
xxxxxxx1 8 data bits
Return Value: None
Example :
int TC_232_parameter(long baud,int parity,int stop,int data)
{
unsigned char cc=0;
unsigned int i_baud;
i_baud = (int)(baud / 10L);
switch (i_baud)
{
case 11 : cc=0x00; break;
case 15 : cc=0x10; break;
case 30 : cc=0x20; break;
case 60 : cc=0x30; break;
case 120 : cc=0x40; break;
case 240 : cc=0x50; break;
case 480 : cc=0x60; break;
case 1920 : cc=0x80; break;
case 3840 : cc=0x90; break;
case 5760 : cc=0xA0; break;
default: cc=0x70; break;
}
switch (parity)
{
case 0 : break;
case 1 : cc=cc|0x04; break;