EPSON Serial Interface Card C82305* C8230* English Deutsch Français ESpañol Italiano 4000152 C01-00
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Serial Interface C82305 * /C82306 * English Schnittstellenkarte C82305 * /C82306 * Deutsch Interface série C82305 * /C82306* Français Interface en serie C82305 * /C82306* Español Interfaccia seriale C82305* /C82306* Italiano
TABLE OF CONTENTS INTRODUCTION About this guide 2 3 SETTING THE CONDITIONS Card layout DIP switch and jumper settings DIP switches Jumpers 4 4 5 5 10 DATA ENTRY Serial communication About data entry Handshaking protocol 13 13 13 14 SPECIFICATIONS 17 HARDWARE DESCRIPTION 19 RECOMMENDED CIRCUIT CONNECTIONS 21 INSTALLATION 22
INTRODUCTION 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.
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.
SETTING THE CONDITIONS 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.
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 switch 1 (interface operations) The table below contains information on switch functions, and the factory setting of each. Table 1. DIP switch 1 Switch number 1-1 Function ON I/F card enable/disable (Note) l-2 Word length l-3 1-4 Parity check 1 Parity check 2 l-5 Baud rate 1 l-6 Baud rate 2 Enable OFF Factory setting Disable ON I 8 bit 7 bit ON OFF See Table 4. OFF ON See Table 5.
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 printer’s 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.
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 printer’s 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.
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 ON: JNOR MARK (do not accept data) = Current ON Factory setting ON ON: MARK (do not accept data)= Negative EIA level J5 ON: MARK (do not accept data) = Current OFF ON: MARK (do not accept data)= Positive EIA level JREV OFF Note Either the JNOR or JREV jumper must be connected.
DATA ENTRY 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.
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.
• 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 X-ON POWER ON X-OFF X-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.
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.
SPECIFICATIONS 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.
5. Handshaking Table 8. Handshaking US-232D Control Loop Using DTR 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 Using X-ON/X-OFF protocol Data transmitted from pin No.
HARDWARE DESCRIPTION 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.
Pin No. Signal Name Direction* 17 TTY-TXD out 24 TTFTXD Return — 25 23 TTY_RXD T e Return x t In 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. Input data of serial Current Loop.
RECOMMENDED CIRCUIT CONNECTIONS Recommended line driver and line receiver for RS-232D signal level settings. (As viewed from the host computer.) Figure 4. RS-232D Serial Interface Card Line Receiver 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.
INSTALLATION 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.
2. Fit both sides of this interface card into the guides inside the compartment. 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.
Receiver Circuit Diagram 122
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