Digital Design EVOLUTION II - Page 82

19 EVOLUTION 1 SYSTEM MANUAL Issue Issue 1.1 20 Dec 2006
Example written in C to query a print station to determine the line speed.
// Query Print Station Address 7 for Line Speed
putchar(0x1b); // Send out ESC
putchar(0x02); // Send out STX
putchar(0x30); // Send out upper nibble of address 07
putchar(0x37); // Send out lower nibble of address 07
putchar(0x26); // Send out a '&' command
putchar(0x01); // Send out SOH
putchar(0x04); // Send out EOT
// Get results from print station
{
unsigned char dummy,speed;
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
speed = getchar() << 4; // Get upper nibble of speed
speed |= getchar() & 0x0f; // Get lower nibble of speed
dummy = getchar(); // Get EOT
} else {
// error handler (not our address)
}
}