Epson C82305 User's Manual PDF

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Summary of Content for Epson C82305 User's Manual PDF


Serial Interface Card

C82305* C8230*

English Deutsch Franais ESpaol Italiano

4000152 C01-00


All rights reserved. Reproduction of any part of this manual in any form whatsoever without Seiko Epsons express written permission is forbidden. The contents of this manual are subject to change without notice. All efforts have been made to ensure the accuracy of this manual. However, should any errorS be detected. Seiko Epson would greatly appreciate being informed of them The above notwithstanding. Seiko Epson can assume no responsibility for any errors in this manual or their consequences. Copyright 1990 by- Seiko Epson Corporation. Nagano, Japan

Serial Interface C82305 * /C82306 *

Schnittstellenkarte C82305 * /C82306 *

Interface srie C82305 * /C82306*






Interface en serie C82305 * /C82306*

Interfaccia seriale C82305* /C82306*


INTRODUCTION About this guide

SETTING THE CONDITIONS Card layout DIP switch and jumper settings DIP switches Jumpers

DATA ENTRY Serial communication About data entry Handshaking protocol





2 3

4 4 5 5


13 13 13 14






The Serial Interface Card 032305 * /C82306 * is an interface that allows asynchronous serial data communication between a host computer and an EPSON printer.

This interface card offers the following features:

Data transmission that can be set at either RS-232D or 20 mA Current Loop levels (RS-232D has been revised from the former RS-232C. Set the signal levels for RS-232D the same as for RS-232C.)

Handshaking protocol using X-on/X-off or DTR flag control

Selectable data word structure that allows you to choose parity (Odd, Even, or None) and word bit settings (either 7 or 8 bit)

Selection of baud rate settings from 75 to 19,200 BPS (Data transmission speed is limited to 1,200 BPS when the signal level is set to 20 mA Current Loop)

l DIP switch 1 settings that you can change even after installation

About this guide This guide is designed to give you detailed information on how to install your C82305 * /C82306 * serial interface card in a variety of EPSON printers. Installation procedures vary slightly depending upon the printer model that you have.

Also included are instructions on how to adjust the settings of the C82305 * /C82306 * interface card, as well as a general description of serial data communication.

The C82305 * /C82306 * option package contains the following items:

C82305* C82306* serial I/F card (1)

Optional connector lock nuts (2)

Note When attaching the interface cable to the interface, you may find that the screws of your interface cable do not fit into the connector lock nuts. If this happens you will need to replace the connector lock nuts with the optional ones provided in this package.



The C82305 * /C82306 * interface card has two sets of DIP (Dual In-line Package) switches, and seven jumpers. These switches and jumpers are used for selecting various interface operations.

Card layout The figure below shows the layout of the C82305 * /C82306 * card, and the locations of the DIP switches and jumpers.

Figure 1. Card layout


DIP switch and jumper settings Before you install the C82305 * /C82306 * interface, you may need to adjust the DIP switch 2 and jumper settings. You can change the DIP switch 1 settings after you install the interface. When making DIP switch setting changes, it is best to use a pointed device, such as a ball-point pen or small screwdriver.

Caution All changes of DIP switch and jumper settings should be made with the printer power turned off. New settings become valid only when the printer is turned on.

DIP switches The settings on DIP switches allow you to change interface functions. The two sets of DIP switches on the C82305 * /C82306* are labelled SW1 and SW2. Each set contains a number of individual toggle-type switches that can be set either on or off. The individual switches are referred to by set (SW1 or SW2) and number. Therefore, the switch in set SW1 marked by the small number 3 is called DIP switchl-3.


DIP switch 1 (interface operations)

The table below contains information on switch functions, and the factory setting of each.

Table 1. DIP switch 1

Switch Function ON OFF Factory number setting

1-1 I/F card enable/disable Disable ON (Note)


l - 2 Word length

l-3 Parity check 1 1-4 Parity check 2


8 bit 7 bit ON

OFF See Table 4.




Baud rate 1

Baud rate 2 See Table 5.



Note Some printers have a selecting switch (or function) that allows you to select between the optional and original interfaces. If you install the interface card in this type of printer, you should set DIP switch l-l on the interface card to ON and also change the setting in the printer to select the optional interface.


DIP switch 2 (interface operations)

The table below contains information on switch functions, and the factory setting of each.

Table 2.

Data word structure

The data word structure is also operator selectable through DIP switch settings (See Table 1). The word structure for serial data is:

1 start bit +7 or 8 data bits (selectable) + 1 parity bit (selectable) +1 or more stop bits.

The table below shows the possible word structure combinations.

Table 3. Word structure

You can select the parity check method by DIP switch settings. (See Table 4.)

Table 4. Parity check

Note Since the selection of parity check depends on your type of printer, refer to your printers manual for details.

Baud rate selection

In serial data communication, data is transmitted in the form of bits. These data bits go out one at a time along a single path, and in a specified order. The BPS (Bits Per Second) rate, or speed at which these bits are transmitted, can be selected using a combination of DIP switch settings.

Note In the current loop mode, accurate data transfer cannot be guaranteed at a baud rate setting exceeding 1,200 BPS.

Table 5. Baud rate selection

Note The printer will assume a setting of 1,200 BPS for

switch combinations other than those shown above.

Since the maximum transmission speed (baud rate) depends on your type of printer, refer to your printers manual for details.

Jumpers The jumper is a small terminal used for connecting or disconnecting a circuit. The jumper is on when the jumper plug covers both wires of the terminal. Jumper settings can be changed by either attaching or removing the rectangular jumper plug. If the jumper is to be turned off, connect it to just one of the two terminal pins as shown in the figure below. By doing this, you can avoid losing the unused jumper plug.

Figure 2. Jumpers


Jumper settings

Table 6. shows information about the interface conditions that can be selected using jumpers. In all cases, ON denotes the connection of the jumper (covering both terminals), while OFF denotes the disconnection of the jumper.

Table 6. Jumper settings

Note If the host computer is not equipped with a power supply for the Current Loop interface, these jumpers must be connected to perform communication via the Current Loop interface.


Table 7. Flag polarity selection

Jumper Function Factory setting

ON: MARK (do not accept data) =

JNOR Current ON ON



ON: MARK (do not accept data)= Negative EIA level

ON: MARK (do not accept data) = Current OFF

ON: MARK (do not accept data)= Positive EIA level


Note Either the JNOR or JREV jumper must be connected.



This section gives a brief description of serial data communication conditions and handshaking protocols supported by the C82305 * /C82306 * interface card.

Serial data communications The CL32305 * /C82306 * interface allows you to select either RS-232D or 20 mA Current Loop signal levels; but never both at the same time.

This interface card also provides for either DTR (Data Terminal Ready) or X-on/X-off handshaking protocol.

About data entry Transmitted data from a host computer is stored in your printers internal buffer. (This interface card has no buffer memory.) When this buffer becomes full, any additional transmitted data cannot be accepted and would be discarded. To prevent such data loss, special handshaking protocols are provided to regulate the flow of data transmission. The two protocols available on the C82305 * /C82306 * interface card are DTR and X-on/X-off.

Note When a parity error (if parity check is enabled), framing error, or overrun error is detected in the data received, data is ignored or an asterisk (*) is printed instead. (Since the handling of communication errors depend on your type of printer, refer to your printers specifications for details.)


Handshaking protocol DTR and X-on/X-off handshaking protocols can be performed under either RS-232D or 20mA Current Loop transmission.

X-on/X-off Protocol X-on/X-off protocol is a system in which the printer transmits a code to the computer to indicate that it cannot accept more data, and a second code when it is once again ready.

The C82305* /C82306* interface card sends an X-on < 11 > H code when it is ready to receive data, and an X-off < 13 > H when it is busy. The X-on/X-off signals may be transmitted from the TXD terminal at RS-232D signal levels, or through the TTY-TXD terminal at 20 mA Current Loop levels.

After the X-on flag has been set, data can be accepted up to the maximum capacity of the buffer.

Transmit timing of X-off signal The X-off signal is transmitted when the vacant area in the buffer drops below the specified value (typically 256 bytes; refer to your printer manual).

Data transfer after X-off signal Data can be sent to the printer even after the X-off signal is transmitted as long as sufficient room for data remains in the buffer. However, if the transmitted data exceeds the vacant area in the buffer, it will be discarded.


Transmit timing of X-on signal The X-on signal is transmitted when the power is first turned on, or when the vacant area in the buffer is greater than the specified value (typically 512 bytes; refer to your printer manual).

Figure 3. X-on/X-off thing


POWER ON Buffer capacity less than specified value

Buffer capacity greater than specified value

DTR protocol

Under this system, when the printer is turned on the DTR enters the SPACE state, meaning that data entry is enabled. When the rate of data reception is greater than that of printing, the buffer gradually fills up. Once the vacant area in the buffer drops below the specified value (typically 256 bytes; refer to your printer manual), the DTR sets the status flag to prohibit further data entry. This flag is output through the DTR pin (No. 20) at RS-232D signal levels, and through the TTY-TXD pin (No. 17) at Current Loop Levels.

1 5

With the status flag set, and data reception prohibited, the vacant area of the buffer gradually increases as the printer continues to print. When the vacant area in the buffer reaches the specified value (typically 512 bytes; refer to your printer manual), the flag is reset and data entry is again enabled.

Note Reverse Channel pin (No. 11) and DTR pin (No. 20) are internally connected on the interface board and must have identical signal levels.

Printer status error

The flag will be set immediately regardless of the remaining buffer capacity if the printer detects an error.



1. Synchronization: Asynchronous

2. Baud Rate: 75, 110, 134.5, 150, 200, 300, 600, 1,200, 1,800, 2,400, 4,800, 9,600, or 19,200 BPS (selectable)

3. Word length: Start bit: 1 bit Data bit: 7 or 8 bits (selectable) Parity bit: Odd, even, none, or ignore (selectable) Stop bit: 1 bit or more

4. Input signal polarity: 1) With RS-232D:

MARK = logic "1' ( - 3 to -25V) SPACE = logic "0" ( +3 to +25V)

2) Current loop: MARK = logic "1" (Current ON) SPACE = logic "0" (Current OFF)

Note The above voltage, between pin No. 17 and No. 24, must not exceed 25V.


5. Handshaking

Table 8. Handshaking

Using DTR protocol

Using X-ON/X-OFF protocol


The two signal The impedance conditions at pm No. between pin No. 17 11 and pin No. 20 are and pin No. 24 is as as follows; follows; MARK-data entry is LOW(MARK)-data disabled entry is disabled SPACE-data entry is High(SPACE)-data enabled entry is enabled

Data transmitted from pin No. 2 is controller as follows; X - O N < l l > H - d a t a entry is enabled X-0FF<13>H-data entry is disabled

Data transmitted by the change of the impedance between pin No. 17 and pin No. 24 is controlled a follows; X - O N < l l > H - d a t a entry is enabled X-OFF<13>H-data entry is disabled

Control Loop


The DTR signal is always set to SPACE while X-on/ X-off handshaking is selected. X-on/X-off characters will not be transmitted from TXD while DTR handshaking is selected (TXD signal is always set to MARK).

Note Operation is not guaranteed when using the current loop mode at rates over 1,200 BPS.



1. I/F board connector: EIA standard 25-pin D-SUB female connector.

2. For signal description and pin assignment, refer to the table below:

Table 9. Signal Description and Pin Assignment Pin No. Signal name Direction Description

1 protective Ground Chasis ground

Transmitted 2 Data (TXD) Text Transmitted serial data

3 Received Data (RXD)

Ill Received serial data

4 Request to o u t

This signal is always at the Send (RTS) positive EIA level.I I

7 Signal Ground In Return path for data and control signals.

Reverse 1 1 Channel Out

(=2nd RTS)

Data Terminalk t20 Out Ready (DIR)


signal is at he positive

EIA Level when the printer is ready to accept data entry and at the negative EIA level when the printer is not ready to accept data entry Operator can invert the polarity of the signal with jumper 15.


Pin No. Signal Name Direction*

17 TTY-TXD o u t

24 TTFTXD Return


High impedance (SPACE) between pin No. 17 and No 24 or an X-on signal sent across pin No. 17 and No. 24 indicates that the printer is ready to accept data. Low impedance (MARK) or an X-off signal being sent indicates that the printer is busy. Operator can invert the polarity of this signal with jumper J5.

25 T T Y _ R X D I n

23 T e x t

R e t u r n

Input data of serial Current Loop.

Note The column heading Direction refers to the direction

of signal flow as viewed from the printer.

All signals except TTY-TXD and TTY-RXD comply with the EIA RS-232D standard.



Recommended line driver and line receiver for RS-232D signal level settings. (As viewed from the host computer.)

Figure 4. RS-232D

Line Receiver

Serial Interface Card

Recommended line interface circuit for 20mA Current Loop signal level settings. (As viewed from the host computer.)

Figure 5. Current Loop

Note The value of "R" should be selected so that the loop current is set between 10 and 20 mA. The "+v" should be 3V to 24V.



The C82305* /C82306* interface card is designed to be installed inside the printer. Installation or removal of the interface board is easy, and requires only a screwdriver.

The following section gives you detailed information on how to install your interface card in a variety of EPSON printers.

Caution Turn off the power to the printer and the computer

before installing the serial interface. Make sure that all power and interface cables are removed.

Avoid touching the printers circuit board contacts, as many of these components are sensitive to static electric charges that may build up on your body.

1. First, you may need to adjust the DIP switches and jumper settings.

If the screws dont fit your interface cable, you will need to replace the connector lock nuts with the optional ones provided in this package.

Note The original CS2305* lock nuts are imperial standard (inch), and the C82306* lock nuts are metric.


inside the compartment. 2. Fit both sides of this interface card into the guides

3. Insert this interface card until the interface pins mate with the connector inside your printer.

4. Secure the interface with the two screws.


Current-Loop Transmitter/Receiver Circuit Diagrams

Set the Jumper Jl, J2, J3, and J4 referring to the following diagrams.

Transmitter Circuit Diagram


Receiver Circuit Diagram



EPSON AMERICA. INC. 2780 Lomita Blvd. Torrance. Cailif. 90505. U S A Phone (213) 539-9140 Fax (213) 534-5854

EPSON UK LTD. campus 100. Maylands Avenue. Hemel, Hempstead. Herts. HP2 7EZ, UK Phone: 442-61144 Telex: 5182467

EPSON AUSTRALIA PTY. LTD. Unit 3, 17 Rodborough Road. Frenchs Forest NSW 2086 Australia Phone: (2) 452-0666 Fax (2) 975-1409

EPSON HONG KONG LTD. 25/F, Harbour Centre. 25 Harbour, Road Wanchal Hong Kong Phone: 8314600 Telex: 65542

EPSON ITALIA S.p.A. V, le F. IIi Casiraghi. 427 20099 SESTO S, GIOVANNI MI. Italy Phone: 2-262331 Fax: 2-2440750

SEIKO EPSON CORPORATION (Hirooka Office) 80 Harashinden. Hirooka Shiojiri-Shi, Nagano-Ken 399-07 Japan Phone: (0263) 52-2552

EPSON DEUTSCHLAND GmbH Zlpicher StraBe 6,4000 Dsseldorf 11 F.R. Germany Phone: (0211) 56030 Telex: 6584786


EPSON FRANCE S. A. 68 bis. rue Marjolin 92300 Levallois-Perret, France Phone: (1) 47-373333 Telex: 610657

EPSON SINGAPORE PTE. LTD. No. 1 Raffles Place #26-00 OUB Centre. singapore 0104 Phone: 5330477 Fax: 5338119

EPSON ELECTRONICS TRADING LTD. (TAIWAN BRANCH) 1OF, No, 287 Nanking E. Road Sec. 3, Taipei. Taiwan R. O. C. Phone: (02) 717-1360 Fax: (02) 712-9164

EPSON IBERICA. S.A. paris. 152, 08036 Barcelona. Spain Phone: 410-34-00 Fax: 439-95-17

1990 May

Printed in

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