Installing An Optional Interface Board - Epson PRO Reference Manual

Handshake timing
When the vacant area for data in the input buffer drops to
256 bytes, the printer outputs an X-OFF code or sets the DTR
flag to 1 (MARK) to indicate that it cannot receive data. When
the vacant area for data in the buffer increases to 512 bytes, the
printer outputs an X-ON code or sets the DTR flag to 0
(SPACE) to indicate that it is ready to receive data.
Error handling
When the printer detects a parity error, it prints an asterisk (*).
The printer ignores all other errors, including framing and
overrun errors.

Installing an Optional Interface Board

1. Turn off the printer.
2. Unplug the printer's power cord from the electrical outlet
and disconnect any interface cables.
c
3. Remove the two screws securing the shield plate to the
optional interface slot; then lift off the plate as shown in the
following illustration. Store the plate in case you later
remove the interface board.
A-6
Using Optional Interfaces
Caution:
Do not install or remove an interface board when the
printer is connected to the electrical outlet. If you do, you
may damage your printer or computer.