Additional Information - PSI Matrix PP 803 Benutzerhandbuch

Appendix A System Interface Description

Additional Information

After Power-ON DTR and RTS are activated and the printer is ready to
receive data.
XOFF is sent, when the interface buffer has only space left for 256
more characters. XOFF is sent again, at a level of 128 characters buffer
space. Further incoming data will be stored until the interface buffer is
full. All data sent in addition will get lost.
XON is sent when the interface buffer provides space for a
minimum of 512 characters.
XON/XOFF can only be sent successfully when CTS is at active state.
When the CTS Mode is set to "CTS ignore" CTS is allways in the active
state.
XOFF will be sent immediately if local mode is entered.
XON is sent again, if local mode is left and a minimum of 512 byte
interface buffer is available.
A-7