Compaq 5532, 5531, 5525B user manual RS-422

RS-422

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

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

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

Table 7. RS-422 Serial Interface Connector Pin Assignments

Input Signals		Output Signals		Miscellaneous
Signal	Pin	Signal	Pin	Signal	Pin
- Receive Data	15	- Transmit Data	19	Chassis Ground	1
(-RD)		(-TD)
+ Receive Data	17	+ Transmit Data	25	Signal Ground	7
(+RD)		(+TD)

+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.

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