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SurePOS 100 Technical Reference
Page 33 of 104
9.3.1.2 Mechanical Error
Immediately after a mechanical error occurs, the printer logic drops DTR.
9.3.2 XON/XOFF Mode
This mode is enabled after the application program transmits the ESC command to the printer. The print
buffer must be empty or this command is ignored.
Figure 3-7. XON/XOFF DTR Signal Timing
After transmission of the ESC command, the printer outputs an XON (DC1 by control code; 11h by
hexadecimal data) to the system. When the application program receives the XON signal, it can transmit
data to the printer. If the data text is not sent from the application program, the printer logic outputs an
XON signal at 3 second intervals until the printer receives data.
The printer starts sending XOFF (DC3, 13h) when the empty space in the buffer reduces below 256
bytes. When the application receives the XOFF signal, it halts output of data. However, the printer logic
can continue receiving data until the buffer becomes completely full.
Output of the XON signal is resumed when the data in the buffer is printed out and drops to below 256
bytes.
Figure 3-8. XON/XOFF Data Buffer
Figure 3-9. XON/XOFF Status Byte