HP D640 Bedienungsanleitung PDF herunterladen (Seite 216)

Using the Serial Interface

B-2 Host Serial and Parallel Interface Configuration

connector. This is a “C” type Bitronics connection. Hewlett-Packard has included an “A-to-C”

parallel printer cable with the printer. The RS-232C connector is the standard DB25 pin

connector, located near the top center of the printer.

You can get more information about HP’s compliance with the IEEE 1284 Standard from the

HP FIRST fax retrieval service at 1-800-333-1917 in the USA and Canada. Ask for document

number 1951. The same document is also available by ftp from:

ftp://ftp-boi.external.hp.com/pub/printers/laserjet/doc/bp02455.asc

Using the Serial Interface

Use the serial interface when you need to locate the printer at some distance (up to 50 feet (15

meters)) from the host computer. You can use either an RS-232C or an RS-422A cable.

Table B-1 lists RS-232C and RS-422A pin assignments and signal descriptions. Those pins not

listed in the table are not used.

Table B-1 Pin assignments for a serial cable

Number

Description RS-232 RS-422 I/O

1 Protective ground. * * -

2 Transmitted data (data from printer). * n/a Output

3 Received data (received by printer). * n/a Input

3 (RS-422) Received data inverted (RDA) (received by printer). n/a * Input

4 Request to send. This signal is HIGH when the

printer is on.

* n/a Output

7 Signal ground. * *

9 (RS-422) Send data inverted (SDA). n/a * Output

10 (RS-422) Send data non-inverted (SDB). n/a * Output

14 Must be connected to ground (7) to select RS-422

mode (SDB).

n/a * Input

18 (RS-422) Receive data non-inverted (RDB). n/a * Input

20 Data terminal ready * n/a Output

* = valid signal

n/a = unimplemented

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HP D640 Bedienungsanleitung Seite 216