Epson C I - 4 0 4 User Manual page 123

Appendix A System Interface Description
Printer DTR may be connected to host DSR + CTS or only to host DSR
Note:
and a bridge between RTS and CTS.
Additional Information
After Power-ON DTR is activated and the printer is ready to receive data.
DTR is deactivated when the interface buffer has only space left for 256 more
characters. Further incoming data will be stored until the interface buffer is full.
All data sent in addition will get lost. DTR is activated again if there is a free
interface buffer space of 512 characters.
DTR is immediately deactivated, if local mode is entered.
It is activated again, if local mode is left and a minimum of 512 bytes interface
buffer is available.
A-4