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default: cc=0x70; break;
}
switch (parity)
{
case 0 : break;
case 1 : cc=cc|0x04; break;
case 2 : cc=cc|0x0c; break;
case 3 : cc=cc|0x08; break;
}
switch (stop)
{
case 1 : break;
case 2 : cc=cc|0x02; break;
}
switch (data)
{
case 7 : break;
case 8 : cc=cc|0x01; break;
}
TD_int_dos1(0x1C,cc,1,0);
regs.h.ah = 0;
regs.h.al = cc;
int86(0x33,®s,®s);
}
05 Open RS-485 multi-bus to send out data
The RS-485 is a multi-bus architecture that means more than one RS-485
I/O port can access the trunk line. Thus, if the RS-485 intends to do serial
data input/output, it must occupy the bus first to prevent from other linked
terminals to send or receive data. The bus will be released while the data
transmission is done and then release the bus to be used by other terminals
for data transmission.
Entry Parameters: AH = 5
Returned Values: None
void TC_485_open()
{
regs.h.ah = 5;
int86(0x33,®s,®s);
}