HP 706C User Manual download pdf (Page 25)

DTE ports use the following signals for communication:

DTE PORT PIN/SIGNAL DEFINITION

Pin Signal

(EIA-232)

Direction Description

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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HP 706C User Manual Page 25