Epson GQ-3500 Kullanıcı Kılavuzu - Sayfa 9

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Ayrıca Epson GQ-3500 için: Ürün Destek Bülteni (3 sayfalar), Ürün Destek Bülteni (27 sayfalar), Ürün Destek Bülteni (8 sayfalar), Ürün Destek Bülteni (20 sayfalar), Ürün Destek Bülteni (14 sayfalar), Ürün Destek Bülteni (25 sayfalar), Ürün Destek Bülteni (13 sayfalar), Ürün Destek Bülteni (2 sayfalar)

Sayfayı Yazdır

The jumpers

Jumpers at J2 are single position jumpers; they can be either

installed or disconnected. To change the settigs of these jumpers you

must put a jumper plug across the two pins. To disconnect a jumper plug,

simply move the plug so that it

right pin open. (All plugs are in this position when the interface is

delivered from the factory.)

Table. Function so the jumpers

Connects DM+ and DM- through a 120 ohm resistor.

Connects RD+ and RD- through

Connects RD- to pin 9

E L

Connects RD+topin 10

D M

Connects DM- to pin 23

DM+

Connects DM+ to pin 24

SD+

Connects SD+topin 12

TR+

Connects TR+ to pin 25

TR-

Connects TR-to pin 13

Communications Protocols

To achieve the maxim um printing speed, the computer should send

characters to the printer faster than the printer can print them. This

ensures that the printer has to stop and wait for more

information. But if you continuously send information to the printer

faster than it can print, sooner or later the printer's buffer will

overflow and information will be lost. A communications protocol keeps

the computer from sending more information than the printer can

handle.

The GQ-35CN7's serial interface can use three different kinds of

communications protocols These are described in detail below.

The ETX/ACK protocol

The ETX/ACK protocol uses a special pair of control codes, ETX

(ASCII 3) and ACK (ASCII 6). The system is very simple: whenever

the GQ-3500 gets an ETX out of its input buffer it sends an ACK back to

the computer. When the computer receives the

to send more information to the printer without fear of overflowing the

buffer.

at J2

on the left pin only, leaving the

rests

120 ohm resistor.

ACK it knows it is safe

Serial Interface