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Pin No.   Signal Name  

Direction*

17

TTY-TXD

o u t

24

T T F T X D

Return

Description

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.

20

Summary of Contents for C8230 Series

Page 1: ...EPSON Serial Interface Card C82305 C8230 English Deutsch Français ESpañol Italiano 4000152 C01 00 ...

Page 2: ...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 ...

Page 3: ...erial Interface C82305 C82306 Schnittstellenkarte C82305 C82306 Interface série C82305 C82306 English Deutsch Français Español Italiano Interface en serie C82305 C82306 Interfaccia seriale C82305 C82306 ...

Page 4: ...ONDITIONS Card layout DIP switch and jumper settings DIP switches Jumpers DATA ENTRY Serial communication About data entry Handshaking protocol SPECIFICATIONS HARDWARE DESCRIPTION RECOMMENDED CIRCUIT CONNECTIONS INSTALLATION 2 3 4 4 5 5 10 13 13 13 14 17 19 21 22 ...

Page 5: ...32D 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 ...

Page 6: ...he 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...

Page 7: ...IP 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 4 ...

Page 8: ... 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...

Page 9: ...length l 3 Parity check 1 1 4 Parity check 2 I 8 bit 7 bit ON OFF See Table 4 OFF l 5 l 6 Baud rate 1 Baud rate 2 See Table 5 ON OFF 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 setti...

Page 10: ...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 ...

Page 11: ...re 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 printer s manual for details ...

Page 12: ...me 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 ...

Page 13: ...ers 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 unuse...

Page 14: ... 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 11 ...

Page 15: ...y setting ON MARK do not accept data JNOR Current ON ON J5 JREV 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 OFF Note Either the JNOR or JREV jumper must be connected 12 ...

Page 16: ... is stored in your printer s 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 ...

Page 17: ... 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 prin...

Page 18: ...pecified 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 furthe...

Page 19: ...he 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 16 ...

Page 20: ...d 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 17 ...

Page 21: ...s controller as follows X ON ll H data 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 ON ll H data entry is enabled X OFF 13 H data entry is disabled Control Loop s 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 ...

Page 22: ...ransmitted 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 t 20 Out Ready DIR This signal is at he positive EIA Level when the printer is ready to accept data entry and at the negative EIA level when the ...

Page 23: ...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 2...

Page 24: ...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 21 ...

Page 25: ...r before installing the serial interface Make sure that all power and interface cables are removed Avoid touching the printer s 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 don t fit your interface cable you will need to replace the connect...

Page 26: ... 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 23 ...

Page 27: ...Current Loop Transmitter Receiver Circuit Diagrams Set the Jumper Jl J2 J3 and J4 referring to the following diagrams Transmitter Circuit Diagram 121 ...

Page 28: ...Receiver Circuit Diagram 122 ...

Page 29: ...0099 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 Zülpicher StraBe 6 4000 Düsseldorf 11 F R Germany Phone 0211 56030 Telex 6584786 l EPSON FRANCE S A 68 bis rue Marjolin 92300 Levallois Perret France Phone 1 47 373333 Telex 610657 EPSON SINGAPORE PT...

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