Data Entry; Serial Data Communications; About Data Entry - Epson C824431 Mode D'emploi

DATA ENTRY

This section gives a brief description of serial data
communication conditions and handshaking protocols
supported by the C824431/C824432 interface card.

Serial data communications

The C824431/C824432 interface allows you to select either
RS-232D or 20 mA Current Loop signal levels; but never
both at the same time.
This interface card also provides for either DTR (Data
Terminal Ready) or X-on/X-off handshaking protocol.

About data entry

Transmitted data from a host computer is stored in your
printer's internal buffer. (This interface card has no buffer
memory.) When this buffer becomes full, any additional
transmitted data cannot be accepted and would be
discarded. To prevent such data loss, special handshaking
protocols are provided to regulate the flow of data
transmission. The two protocols available on the C824431/
C824432 interface card are DTR and X-on/X-off.
Note
When a parity error (if parity check is enabled), framing
error, or overrun error is detected in the data received, data
✱
is ignored or an asterisk( ) is printed instead. (Since the
handling of communication errors depend on your type of
printer, refer to your printer's specifications for details.)
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