Error Handling - Epson ActionPrinter 4000 User Manual

The Interface Boards
For all other data transfer conventions, such as word structure or
communications protocol, use the information in the manual
supplied with your #8143 optional interface.
Baud rate selection
You can select baud rates from 75 to 19,200 BPS (Bits Per Second).
When setting the baud rate, make sure you use the bit rate selection
table for printers with buffers (in the #8143 interface manual).
For more information on your printer's input buffer settings, see the
section on DIP switch functions in Chapter 3 of this manual.
Handshaking 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) indicating that it cannot receive data.

Error handling

When a parity error is detected, your printer prints an asterisk (*).
All other errors, including framing and overrun, are ignored.
5-42 Using the Printer Options