Epson GQ-3500 User manual

EPSON

Serial Interface

for the

GQ-3500

Printed in Japan

88.11-5

Y59099101000

Serial Interface

The serial interface is an option for your CQ-3500 printer. These

pages tell you how to install and use the serial interface.

The GQ-3500 serial interface is actually two interfaces in one. It

can be used as either an RS-232C interface (the factory setting) or an

RS-422 interface, depending on the settings of the jumpers on the circuit

board.

Setting up the Serial Interface

When you receive your serial interface, it is configured as an

RS232C interface, 9600 baud, 8 data bits, no parity, 1 or 2 stop bits,

with the printer ready protocol enabled. This configuration will work

for many applications

To use this configuration with

PC computers, use the

following command at the DOS prompt

MODE COM1:9600,N,8,1,P

If you need to change the configuration of the serial interface

follow these steps:

Refer to your computer and software documentation to see what the

requirements are for a serial interface printer.

2. Select the RS-232C or RS-422 interface. The jumpers at Jl and J2

will have to be reconfigured for RS-422. Because RS232C is the

factory setting, the jumpers will not have to be reconfigured if you

choose this interface. For information on the location of Jl and J2

and on how to reconfigure the jumpers for the specific settings

described below, see the Serial Interface Jumpers section.

If you have changed the factory settings and want to reconfigure

the lumpers for RS232C operation, set the jumpers at Jl and J2 as

follows. At Jl, move REV, RD, and SRI to the left.

At J2, all

jumpers should be disconnected.

Serial Interface

1 I

For RS422 operation, set the jumpers at Jl and J2 as follows.

At Jl,

move REV, RD, and SRI to the right. At J2, set all jumpers in the

installed position, except for TR+ and TR-.

Jumpers that were not given a especific setting above do not need to

be changed to select RS-232C or RS-422 operation (although they

may affect how the interface works).

Select a baud rate by setting DIP switches 4-1, 4-2, and 4-3 as

indicated in Table 2.(For more information on setting DIP

switches, see the Serial Interface DIP Switches section of this

chapter.)

Select 7 or 8 data bits by setting DIP switch 4-4 on for 8 bits per

character or off for 7 bits per character. Using 8 bits per character

is usually best.If you selected 7 data bits, select even, odd, or no

parity and set DIP switches 4-5 and 4-6 appropriately.

Select a handshaking protocol.If you are using a commercial

software program, look in the manual to see if it requires a

particular protocol. If not, try the printer ready protocol. Set DIP

switches 5-l through 5-4 appropriately.Note that you can use

more than one protocol at the same time.For additional

information, see the Communications Protocols section.

Customize the interface if you need more control of the serial

interface.Study the functions shown in Table 3 that describe the

jumpers.For example,’ it’s possible to add DSR, CIS, and DCD

control to the interface.

Installing the Interface

Installing the serial interface is easy and doesn’t require any tools.

Just follow these steps:

Make sum that the power to the printer is off.

Set the DIP switches on the interface card as described in

Appendix C.Use a ballpoint pen or similar object to set the

Switches

Serial Interface

Configure the jumpers on the serial interface card as described

above.

Remove the parallel interface from the back of the printer by

loosening the two Knobs and pulling its straight out as shown in

Figure 1. Store the parallel in the box that the serial

interface came in

Figure 1. Removing the interface

5. Slide the serial interface into the slot on the back of the printer

until it is flush with the printer case.

Tighten two two knobs to secure the interface.

Connect the serial cable from your computer to the interface.

Serial Inteface

The Serial Interface DIP Switches

On the right side of the serial interface are two banks of DIP

switches, as shown in Figure 2. Group 4 is on the left and 5 is on the

right.) switches control many of the of the interface ,as

detailed in Table 1.

settings. You can use a ballpoint pen to change the switch

Because DIP switch groups 1 and 2 are the same for both the

serial and parallel, the DIP switch information in Chapter2

and Appendix C applies to both interfaces

Figure2. The serial interface DIP switches

4Serial Interface

Table 1. Serial interface DIP switches

Serial Interface

Setting the data trader rate

The following table shows the DIP switch settings for the various

possible data transfer (baud) rates

Table2. Baud rate settings

The Serial Interface Jumpers

The following tables describe the functions of the jumpers on the

serialinterface. The main function of these jumpers is to switch

between RS-232 C and RS-422 operation, but some of the jumpers allow

you to customize the interface.

The jumpers are located on the interface card as shown in Figure 3.

Figure3. The serial interface jumpers

6serial Interface

The jumpers at Jl

The jumpers at J1 are two position jumpers. The small plugs can be

moved from the left two wires to the right two wires to change the

settings.

Table 3 describes the functions of the jumpers at Jl. When

delivered from the factory, all jumpers are in the left position.

Table3. Functions of the jumpers at J1

Serial Interface

The jumpers at J2

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

rests

on the left pin only, leaving the

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

delivered from the factory.)

Table. Function so the jumpers

DM+

SD+

TR+

TR-

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

Connects RD+ and RD- through

120 ohm resistor.

Connects RD- to pin 9

Connects RD+topin 10

Connects DM- to pin 23

Connects DM+ to pin 24

Connects SD+topin 12

Connects TR+ to pin 25

Connects TR-to pin 13

Communications Protocols

To achieve the maximum 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

ACK it knows it is safe

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

buffer.

Serial Interface

The GQ-3500 has a buffer that will hold up to 102 characters,

including the ETX code at the end of the group. The computer can

send the first group of characters and then stop until the first ACK is

received. From then on,every time an ACK is received, another

group of characters can be sent.

DlP switch 5-2 controls ETX/ACK protocol. If DIP switch 5-2

iS Off, the GQ-35OO is ignored the ETX code.

The DCl/DC3 or XON/XOFF protocol

The DC1/DC3 protocol also uses a special pair of control codes,

DCl (AscII 17 decimal, also knwon as XON) and DC3 ( ASCII 19)

decimal, also known as XOFF) This communications protocol is

selected by turning DIP switch 5-1 on.

In this protocol the printer sends a DC3 to the computer to suspend

data entry under the following conditions

1. when the input buffer becomes nearly full (within 128 bytes)

2 When the printer goes offline (by pressing the ONLlNE button)

3. When the printer runs out of paper

When the printer runs out of toner

5. When an errror is detected.

when the computer receives the DC3 signal it must stop within

128 characters) sending information until the printer sends a DCl signal

to say that there is more room in the buffer. The printer sends the DCl

signal when the buffer has room for 255 characters

If DIP switch 5-4 is on, the printer will send an additional DC3

after each additional character it receives after it sends the first DC3.

This is called the multiple XOFF function.

The printer ready protocol

The printer ready protocol is a hardware protocol because it uses

one of the wires in cable connecting the computer and printer to tell

the computer where , the printer is ready to accept information. This

communications potocol is selected by turning DIP switch 5-3 on.

serial Interface

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