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.

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Compaq P5000 Series setup guide RS-232 and RS-422 Serial Interface Configuration, RS-232 only