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Chapter 5 RS-232 and RS-422 Serial Interfaces
Framing Error Handling. Framing error checking is always in effect for the
serial interface.
When a framing error occurs, an exclamation point (!) is printed. If 20
successive errors are received, a line feed is added to force printing to occur.
Overrun Error Handling. Overrun error checking is always in effect for the
serial interface.
When a data overrun error occurs, an asterisk (*) is printed. If 20 successive
errors are received, a line feed is added to force printing to occur.
RS-232 and RS-422 Serial Interface Configuration
Your printer is configured at the factory to match the interface you specified.
By using the control panel, you can verify and change several interface
parameters in order to meet specific application requirements.
Refer to “Serial Submenu” on page 104 for RS-232 and RS-422 parameter
descriptions and information on selecting values for the following parameters:
RS-232 and RS-422
• Baud Rate (data rate selected from the control panel)
• Data Bits (7 or 8 Bits)
• Stop Bits (1 or 2 Bits)
• Parity (None, Odd, Even, Mark, or Sense)
RS-232 only
• Data Terminal Ready logic
• Request to Send logic
Some application programs require a unique configuration. If the printer is not
working properly with the configuration you selected, contact an authorized
service representative.
NOTE: When using Compaq’s RapidPrint™ 200 LAN product, DTR must be
disabled from the RapidPrint.