Digital Design EVOLUTION II - Page 83

20 EVOLUTION 1 SYSTEM MANUAL Issue Issue 1.1 20 Dec 2006
Example written in C to send a line speed to a print station
// Send Print Head Address 2 Line Speed of 100 feet per minute.
putchar(0x1b); // Send out ESC
putchar(0x02); // Send out STX
putchar(0x30); // Send out upper nibble of address
putchar(0x32); // Send out lower nibble of address
putchar(0x26); // Send out '&' command
putchar(0x36); // Send out upper nibble for Line Speed 100
putchar(0x34); // Send out lower nibble for Line Speed 100
putchar(0x04); // Send out EOT
// Get results from print station
{
unsigned char dummy;
dummy = getchar(); // Get ESC
dummy = getchar(); // Get STX
dummy = getchar() << 4; // Get upper nibble of address
dummy |= getchar() & 0x0f; // Get lower nibble of address
if(dummy == our_address)
{
dummy = getchar(); // Get command
dummy = getchar(); // Get ACK for print station
if(!dummy == ACK)
{
// error handler (didn't get acknowledgement from printer)
} else {
dummy = getchar(); // Get EOT
}
} else {
// error handler (not our address)
}
}