HP 710E, 710F, 708D, 708E, 706C, 706D, 708C, 706A DTE ports use the following signals for communication

DTE ports use the following signals for communication:

DTE PORT PIN/SIGNAL DEFINITION

Pin	Signal	Direction	Description
	(EIA-232)
1	PGND	---	Protective Ground
2	Tx	Output	Data Out
3	Rx	Input	Data In
4	RTS	Output	Request To Send
5	CTS	Input	Clear To Send: Input handshake line. Must be positive
			voltage before DTE device will transmit data.
6	DSR	Input	Data Set Ready: Input handshake line. Must be positive
			voltage before DTE device will transmit data.
7	SGND	---	Signal Ground
8	DCD	Input	Data Carrier Detect: Generally used for modem
			communication.
20	DTR	Output	Data Terminal Ready: Output handshake line. DTE device
			will set this line to negative voltage when it can no longer
			receive data.

If you are interfacing a DTE device to Print Master (DCE), you must use a one-to-one or straight cable as in Figure 2 on the following page. If you are interfacing a DCE device to Print Master, you must use a crossed cable as in Figure 3 on the following page.

When using XON/XOFF protocol, it may be desirable to use cables with only Tx, Rx and SGND (signal ground) connected. On the serial ports of Print Master, input handshaking lines are enabled if nothing is connected allowing the system to operate with only Tx, Rx and SGND connected.

CAUTION: Do not attempt to use a serial cable on a parallel port. Since an EIA-232 serial port usually carries a potential of +12 and -12 volts, plugging a serial cable from that port into a parallel port may cause damage to the parallel port.

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