Epson 8900 Series manual XON/XOFF transmit-on/transmit-off, Robust XON/XOFF

XON/XOFF (transmit-on/transmit-off)

For this busy-handling protocol, the printer sends a single XON (a DC1 control character) to indicate that it is ready to receive data and a single XOFF (a DC3 control character) to indicate that it is busy. The default setting is OFF.

Robust XON/XOFF

For the robust XON/XOFF protocol, the printer sends an XON (DC1 control character) approximately every 5 seconds to indicate that it is ready to receive data until either data is received or another busy condition occurs. The printer sends an XOFF (DC3 control character) when the initial busy condition occurs (buffer overflow) to indicate that it is busy. If the host continues to send data, the printer sends an XOFF approximately every 20 ms until the hosts stops sending data. The default setting is OFF.

The following table lists the ready and busy points using the XON/XOFF protocol.

LCD Display of	Busy Point	Ready Point
Buffer Size	From Empty	After Busy
32,000	@ 32,000 Bytes	@ 31,250 Bytes
4,000	@ 4,000 Bytes	@ 3,250 Bytes
256	@ 256 Bytes	@ 128 Bytes

Note: Actual buffer size is 32,768 bytes; overflow error status only occurs after 32,768 bytes.

Printer Setup 2-12