Printronix P5000LJ user manual RS-232 And RS-422 Serial Interface Protocol

RS-232 And RS-422 Serial Interface Protocol

Data Carrier Detect (DCD). Status signal to the printer. The ON condition is required for the printer to receive data.

Data Terminal Ready (DTR). Control signal from the printer. Subject to configuration.

RS-422

+RD, -RD. Serial data stream differentially received by printer.

+TD, -TD. Differentially driven serial data stream for transmitting status and control information to the host. Subject to protocol selection.

Note ±RD and ±TD form signal and return paths of a differential line signal.

RS-232 And RS-422 Serial Interface Protocol

X-ON/X-OFF. The printer transmits an X-ON character (hex 11) when entering the Online mode or when the buffer is almost empty. The printer transmits an X-OFF character (hex 13) when entering the Offline mode or when the buffer is almost full.

RS-232 And RS-422 Serial Interface Error Handling

Note All serial errors are treated as faults that require operator intervention.

Parity Error Handling. Parity error checking is a configuration option selected from the operator panel.

With odd or even parity checking selected, a character with a parity error is replaced with a question mark (?) character.

When parity checking is not selected (“NONE” on the operator panel), parity errors are ignored and the characters are printed as received.

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.

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