RS-232 And RS-422 Serial Interface Signals

RS-232 And RS-422 Serial Interface Signals

The RS-232/RS-422 connector mounted on the printer is a 25-pin DB-25S type. The mating connector is a DB-25P. RS-232 and RS-422 compatible serial interface signals are defined as follows:

RS-232

Transmitted Data (TD). Serial data stream from the printer for transmitting status and control information to the host. Subject to protocol selection.

Received Data (RD). Serial data stream to the printer.

Request To Send (RTS). Control signal from the printer. Subject to configuration.

Clear To Send (CTS). Status signal to the printer indicating the host is ready to receive data/status signals from the printer.

Data Set Ready (DSR). Status signal to the printer indicating the host is in a ready condition.

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.

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HP LQH-HW 3ULQWHUV manual RS-232 And RS-422 Serial Interface Signals, RS-232 And RS-422 Serial Interface Protocol
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LQH-HW 3ULQWHUV specifications

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