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Epson 420i, User Manual

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Epson 420i User Manual Download Page 30

Electrial Conditions

1. Signal Level

ON

OFF

Space

+3V ~ +15V

Mark

-3V~-15V

2. Input/Output Conditions

• 

Input signal

• 

Output signal

Handshake Protocol

Handshake protcol is selected by the DIP switch settings as show in in the table below

1. READY/BUSY Protocol

The DTR line indicates the READY/BUSY state of the printer. It outputs an ON
(+ 12V) in the READY state, and an OFF (-12V) in the BUSY state. When the

remaining space of the 18K-byte communication buffer goes below 4K bytes, the
DTR line turns OFF, terminating the transmission of data from the computer. Then
when the buffer space increases to above the 10K-byte level, the DTR line turns ON,
allowing data to be sent from the computer.

When the printer is in the paper empty state or the cover has been opened, the DTR
line goes OFF. The SRTS line output is identical to the DTR output. The printer can

receive up to 4K bytes more after the DTR line goes OFF.

2. X-ON /X-OFF Protocol

When the printer is receiving data, X-ON is output. When the printer is not able to

receive data, X-OFF is output. When the computer receives the X-OFF signal, transmis-
sion of data to the printer is terminated. If the X-ON signal is then received, data
is transmitted once again, When the communication buffer space goes below 4K
bytes, X-OFF is sent. When the buffer space goes beyond 10K bytes, X-ON is sent.

X-ON is DC1 (11 HEX), and X-OFF is DC3 (13HEX). These signals are output through
the TR line. The data format is the same as the input data structure.

24

Summary of Contents for 420i

Page 1: ...HIGH S BUSINESS PEED PRINTER USER S GUIDE EPSON AMERICA INC SERVICE DIVISION ...

Page 2: ...EPSON 420i HIGH SPEED BUSINESS PRINTER Epson America Inc Computer Products Division 2780 Lomita Blvd Torrance CA 90505 213 539 9140 ...

Page 3: ...interference will not occur in a particular installation If this equipment does cause interference to radio or television reception which can be determinded by turning the equip ment off and on the user is encouraged to try to correct the interference by one or more of the following measures Reorient the receiving antenna Relocate the computer with respect to the receiver Move the computer away fr...

Page 4: ...e printer commands In contrast with the IBM Graphics Printer the Epson 420i prints italic characters Most programs written for the IBM Graphics Printer do not attempt to print them The IBM Graphics Printer mode is selected when extended characters are to be used or when software is limited for use with the IBM Graphics Printer Refer to the sections tied DIP Switch Setting page 26 Code Table pages ...

Page 5: ...bbon guide and the printhead as shown in Figure 3 Wait at least two seconds after turning power off before turning it back on again The initialization process may not be performed correctly if this is not done The printer should be used where the humidity is low there is little dust and where it is not in direct sunlight Do not perform printing without the ribbon cassette and paper properly instal...

Page 6: ...ENT OF THE RIBBON CASSETTE 6 PAPER SETTING 9 MAIN FUNCTIONS 13 PARALLEL INTERFACE 18 SERIAL INTERFACE 22 DIP SWITCH SETTING 26 CODE TABLE 30 CONTROL CODE SUMMARY 33 PRINT MODE FLOWCHART 37 CONTROL CODE EXPLANATION 38 PROGRAM EXAMPLES 50 APPENDIX 77 v ...

Page 7: ...ximum value of n is 1632 Any one of 17 fonts may be selected from the five available print modes Each font may be used exclusively or intermixed within any given line When a mode change is indicated data already input is printed in the mode first selected the printer skips a few spaces changes mdoes and then receives new data Speed of printout CPS is slightly different in each mode depending on op...

Page 8: ...Detailed Summary of Character Fonts 2 ...

Page 9: ... plus 4 copies non carbon total thickness 0 3mm or less 10 Ribbon Cassette style single color Other Specifications 1 Power Supply 117VAC 10 220 240VAC 10 50 60Hz 2 Temperature during operation 5 C 40 C 41 F 104 F 3 Humidity during operation 20 80 4 External Dimensions 595 mm width x 194 mm height x 405 mm depth 5 Weight 6 Power Consumption 23 4 x 7 6 x 15 9 inches The depth is 580mm when the paper...

Page 10: ... state a one page form feed is performed The page length is selected by the FORM dial switch or by code designation 5 TOF SET Switch TOP OF FORM If the TOF SET switch is pressed in the OFF LINE state the existing paper position becomes the TOP OF FORM The page length is designated by the FORM dial switch The buzzer sounds for 0 1 second after this switch is pressed 6 FORM Dial Switch This switch s...

Page 11: ...e ON LINE state The ON LINE lamp is lit when the printer is ON LINE off when the printer is OFF LINE When the printer is OFF LINE a BUSY signal is output by the printer 11 P EMPTY Lamp Red When a paper empty signal is detected the P E indicator lights and the buzzer sounds for 3 seconds At this time the printer goes OFF LINE and the BUSY and P EMP signals are output If paper empty is detected duri...

Page 12: ...RIBBON CASSETTE REPLACEMENT Installing the Ribbon Cassette 1 Open the printer cover and push the paper pressure bar toward the platen as shown in Fig 1 Fig 1 6 ...

Page 13: ...wisted Fig 2 4 Tighten the ribbon by twisting the ribbon feed knob in the direction of the arrow Fig 3 Make sure that the ribbon is properly positioned in the guide as shown below Fig 3 Fig 4 5 The installation is complete once the head adjustment lever has been returned to position 2 3 or 4 any of which is a position for a single sheet of paper The higher the number that the lever is set on the g...

Page 14: ...ibbon Cassette 1 Push the paper pressure bar towards the platen side Pull the head adjustment lever forward Fig 5 2 As shown in Fig 6 hold the ribbon cassette in both hands and pull the ribbon cassette upward Fig 6 8 ...

Page 15: ...tting 1 Attach the paper rack to the rear of the printer by inserting it into the two holes located there as shown in Fig 8 Connect the ground wire It is located between the paper rack and the power cable receptacle s right hand screw shown in Fig 8 Failure to do so may cause malfunction of the printer The purpose of this ground connection is to eliminate static electricity formed by the paper 9 ...

Page 16: ...e to move Fig 9 3 Insert the paper into the back of the printer following the paper feed path 1 as shown in Fig 7 Fig 10 4 Push the tractor into its original position until it clicks If the tractor lock levers located at either side of the tractor shaft are pushed up as shown in Fig 11 the tractor can be moved horizontally to adjust it to match the width of the form being used Fig 11 10 ...

Page 17: ...ck it into this position Fig 12 7 Push the paper pressure bar towards the platen 8 For one part fan fold paper the head adjustment lever is usually set at position 2 However when printing an original plus 4 copies it should be moved 3 or 4 clicks forward 9 As shown in Fig 13 the side stoppers located at each side of the paper rack s form feed roller should be adjusted to match the width of the for...

Page 18: ... feed tractor paper setting is illustrated as path 2 in Fig 7 Because the form is fed in from the bottom a special type of desk is required 1 Pull the paper pressure bar forward and make sure that the friction lever is also in the forward position marked PIN FEED Fig 9 2 Insert the form as done for path 2 of Fig 7 3 Move the tractor lock lever upward Fig 11 4 Perform steps 5 8 for the rear feed tr...

Page 19: ...opened 2 Right Overrun Switch This switch detects the printhead carrier when it reaches the right most limit 3 Temperature Detection Function This detector recognizes abnormal temperature levels within the printer Note In the case of 2 or 3 if an abnormality is detected the ERROR and BUSY signals are output The printer mechanism s power supply is also turned off To reset this condition an INITIAL ...

Page 20: ... the ON LINE state If the RESET or ON LINE switch is pushed though no paper has been inserted the printer enters the OFF LINE state the P EMP lamp lights and the buzzer rings for 3 seconds after executing the initialization operation When printing is halted because of a cover open condition the printer performs ini tialization and enters the ON LINE state only after the printer cover is closed and...

Page 21: ...SELF TEST PRINT EXAMPLE EPSON MODE ...

Page 22: ...16 ...

Page 23: ...head Protection During high density printing a heat detector within the printhead protects the coils from damage due to overheating by reducing print speed The sensor recognizes two temperature warning levels At level one a 200 ms pause in the print cycle oc curs before the next line is printed At temperature level two a 5 second pause in the print cycle will occur allowing the heat to dissipate T...

Page 24: ...gnal with 1 being HIGH STROBE Strobe signal used to read 8 bits of data Data is input when the signal is LOW INITIAL Puts the printer into its initial state This signal is usually HIGH When it goes LOW and then HIGH again the printer is initialized 2 Signals from the Printer BUSY This signal shows that the printer is in the BUSY state When it is HIGH data cannot be received The following are condi...

Page 25: ... signal shows that the printer is in the error state and occurs in the following circumstances a If the circuit component s temperature increases to an abnormal level b If the right overrun switch is activated c If current flows through a pin of the printhead when printing is not required d If the home sensor is not operating properly during initialization operations e If the RAM error is detected...

Page 26: ...ns a Input Signals INITIAL signal and STROBE signal b Output Signals BUSY ACK ERROR P EMP signals 3 Signal Cable Length The maximum length is 2 meters All the signal lines should be run as twisted pairs with the GND lines 20 ...

Page 27: ...Timing Chart a Data input b Initialization DIP Swtich Setting The parallel interface is selected when DIP switches 1 1 and 1 2 are set as follows 21 ...

Page 28: ... is to be used perform the following to the jumpers J1 J2 J4 and J5 on the circuit board in the printer If DSR is to be used cut J2 and connect a jumper at J5 If CD is to be used cut J1 and connect a jumper at J4 Note 2 RTS and CTS are connected within the printer If CTS is to be used cut J3 and connect a jumper at J6 CAUTION Changes in jumper connections should only be made by an authorized Epson...

Page 29: ...ADY A signal that displays the state of the modem NC OFF The modem cannot receive transmit data ON The modem can receive transmit data CD CARRIER DETECT A signal that indicates whether or not the carrier is detected NC OFF No Carrier ON Carrier 2 Output Signals from the Printer TR TRANSMIT DATA Employed for the X ON X OFF and ETX ACK control RTS REQUEST TO SEND On SPACE state is continuously outpu...

Page 30: ...allowing data to be sent from the computer When the printer is in the paper empty state or the cover has been opened the DTR line goes OFF The SRTS line output is identical to the DTR output The printer can receive up to 4K bytes more after the DTR line goes OFF 2 X ON X OFF Protocol When the printer is receiving data X ON is output When the printer is not able to receive data X OFF is output When...

Page 31: ... is ON the 7 bit length is selected When the switch is OFF the 8 bit length is selected Stop Bit One bit or more are required for the stop bits However when DIP switch 1 3 is ON and is set to 7 bits and when there is no parity setting by SW 1 6 and SW 1 7 there is a need for 2 or more stop bits Parity Whether a parity bit is to be used and whether odd or even parity is to be used is selected by SW...

Page 32: ...hes All DIP switch selections should be performed with the power OFF The switches are located at the rear of the printer next to the input connector As shipped from the factory all switches are turned OFF DIP Switch Bank 1 DIP Switch Bank 1 controls the selection of the interface that you want to use If you are using a parallel interface then you should be able to leave this bank of switches alone...

Page 33: ...different features First you must decide if you want to use the Epson FX mode or the IBM Graphics Printer mode determined by Switch 2 4 LF Line Feed Command Selection A carriage return is executed when the printhead returns to the print start or left margin position CR Carriage Return Command Selection Auto CR SW 2 2 Execute a carriage return upon Disabled OFF receiving a line feed Enabled ON If S...

Page 34: ...de Selection Select operating mode Printer Mode Epson Printer IBM Graphics Printer SW 2 4 OFF ON Note Switch 2 4 changes several functions of the printer See the differences be tween the Epson Printer mode and the IBM Graphics Printer mode page 36 International Character Set Selection Note Switch 2 8 is not used 28 ...

Page 35: ...The international character set selection does not become valid until the printer is turned ON once again The table below shows the international characters International Characters 29 ...

Page 36: ...CODE TABLE The control code tables for the Epson and IBM character set 1 and 2 modes are shown below CODE TABLE EPSON MODE 30 ...

Page 37: ...CODE TABLE IBM CHARACTER SET 1 31 ...

Page 38: ...CODE TABLE IBM CHARACTER SET 2 Note Encircled characters are selected by the DIP switches 32 ...

Page 39: ...CONTROL CODE SUMMARY CATEGORY ITEM SYMBOLS HEX DECIMAL CODE FUNCTION PRINT COMMANDS CHARACTER DESIGNATIONS CHARACTER FORMAT DESIGNATIONS DOUBLE WIDTH MODE 33 ...

Page 40: ...34 ...

Page 41: ...he table below 0 Can be used simultaneously x Cannot be used simultaneously The bold and double strike modes may not be entered simultaneously The last mode input has priority In all print modes the double width mode may be used simultaneously with the bold or double strike print modes 35 ...

Page 42: ...ter mode includes 8 international character sets Within each set 12 characters may be different from country to country You can choose the set that you want with Switches 2 5 2 6 and 2 7 or with a software command The software command is ignored if you are using the IBM Graphics Printer mode 2 Two of the commands to set line spacing a n d work dif ferently with each option When you choose the Epso...

Page 43: ...refers to condensed printing Note 1 Italic print mode is set by and terminated by 2 This flow chart is valid only when the MODE dial switch is set to 0 If any other is selected the software designations of the above are ignored 37 ...

Page 44: ...printing until the top of the next page is reached The setting for one page is performed by the switch located at the front of the printer or by the software designation Print data following the command is printed at the beginning of the line The double width character mode set by the command is terminated 4 0B H 11 D 8B H 139 D Input of this code results in a paperfeed until the next vertical tab...

Page 45: ... 155 240 n D This code selects and cancels the proportional print mode n 01 H or 31 H Selects proportional print mode n 00 H or 30 H Cancels proportional print mode When the proportional print mode is set the code and code are ignored 11 12 H 18 D 92 H 146 D This code terminates the condensed print mode 12 1B 53 00 H 27 83 0 D 9B D3 OO H 155 211 0 D This code selects the superscript print mode 13 ...

Page 46: ... strike Italic print you would calculate the value of n like this Elite 1 Double strike 16 Italic 64 n 81 Character Format Commands 16 1B 45 H 27 69 D 9B C5 H 155 197 D This code selects the bold print mode This code is invalid in the superscript subscript print mode The double strike mode is cleared when this code is selected 17 1B 46 H 27 70 D 9B C6 H 155 198 D This code terminates the bold prin...

Page 47: ...print mode 24 1B 36 H 27 54 D IBM mode only In the IBM Graphics Printer mode this command selects the IBM Graphics Printer character set 2 which includes characters not contained in character set 1 25 1B 37 H 27 55 D IBM mode only In the IBM Graphics Printer mode this command selects the IBM Graphics Printer character set 1 Double Width Character Printing Commands 26 0E H 14 D 8E H 142 D This code...

Page 48: ...s that indicate the number of bytes of graphic data The number is n2x256 n1 The n1 is the low byte and the n2 is the high byte After this code has been performed all settings remain unchanged The amount of printable data per line is 816 dots maximum If a printing designation input exceeds this amount the remainder is ignored The automatic printing func tion does not operate in this case The relati...

Page 49: ...of m see table below The values of n1 and n2 are determined as in the other graphics com mands i e n1 n2 256 the number of dot columns This command must be followed by the correct number of graphic data 1 byte per column for m 0 to 6 2 bytes per column for m 7 Value of m Function of Command 0 Same as ESC k 1 Same as ESC L 2 Same as ESC Y 3 Same as ESC Z 4 Same as ESC K 5 Same as ESC K 6 Same as ES...

Page 50: ...verse order the setting is terminated at that point When the horizontal tabs are set in pica print mode elite print mode or condensed print mode and the mode is changed the position of the tabs on the paper remains the same When the left or the right margin is set the tab position already set is cleared The left margin position is considered to be the home position and horizontal tabs are automati...

Page 51: ...the time this command is performed becomes the head of the first page The page length will not change even if a line feed amount is altered 41 1B 43 00 n H 27 67 0 n D 9B C3 00 n H 155 195 0 n D 1 n 22 When n m 23 or n 0 this is ignored This code sets the page length in inches The n is the number of inches Vertical Tab Commands 42 1B 42 n1 n2 nk 00 H 27 66 n1 n2 nk 0 D 9B C2 n1 n2 nk 00 H 155 194 ...

Page 52: ...inch 48 1B 33 n H 27 51 n D 9B B3 n H 155 179 n D This code sets the line feed pitch to n 180 inch 49 1B 41 n H 27 46 n D In the IBM Graphics Printer mode this command only defines a line spacing of n 60 inch This command must be followed by the command to actually set the selected line spacing In the Epson Printer mode this command sets the line spacing to n 60 inch 50 1B 2E H 27 46 n D This code...

Page 53: ...only In the Epson Printer mode this code sets the eighth data bit to 1 56 Epson mode only 1B 23 H 27 35 D In the Epson Printer mode this command cancels control of the eighth data bit set by either the set eighth bit or clear eighth bit command Skip Over Perforation Commands 57 1B 4E n H 27 78 n D 9B CE n H 155 206 n D This code sets skip over perforation line feed mode The n is set in line units ...

Page 54: ...d 61 Epson mode only 1B 52 n H 27 82 n D In the Epson Printer mode this command selects from one of the 8 international character sets as shown in the table below n Country 0 U S A 1 France 2 Germany 3 U K 4 Denmark 5 Sweden 6 Italy 7 Spain n is binary number Buzzer Command 62 07 H 07 D 87 H 135 D This code causes the buzzer to sound for approximately 1 3 second Reset Command 63 1B 40 H 27 64 D 9B...

Page 55: ...tion can also be selected by operating switches If the FF switch is pressed in the ON LINE state the unidirectional printing is selected after buzzing for 0 1 second If the LF switch is pressed in the ON LINE state the bidirec tional printing is selected after 0 1 second of sounding the buzzer Paper Out Sensor On Off Commands 65 1B 38 H 27 56 D This code turns the paper out sensor off and allows y...

Page 56: ...PROGRAM EXAMPLES 50 ...

Page 57: ......

Page 58: ...52 ...

Page 59: ......

Page 60: ......

Page 61: ...1 1 Termination of condensed 1 3 Subscript 1 4 Termination of superscript subscript Refer to 13 55 ...

Page 62: ...1 5 Elite double strike italic 16 Bold 1 7 Termination of bold Refer to 16 56 ...

Page 63: ...18 Double strike 1 9 Termination of Double strike Refer to 18 5 7 ...

Page 64: ...20 High quality 21 High quality ON OFF 56 ...

Page 65: ...2 2 Italic 2 3 Termination of Italic Refer to 22 59 ...

Page 66: ...24 IBM character Set 1 25 IBM character Set 2 60 ...

Page 67: ...26 Double width 27 Double width Refer to 26 2 6 Termination of double width Refer to 26 29 Double width 61 ...

Page 68: ...3 0 Standard graphic 31 Double density graphic 32 High density graphic 62 ...

Page 69: ...33 Selected density dot graphics 63 ...

Page 70: ...34 High speed double density dot graphics 35 Quadruple density dot graphics 64 ...

Page 71: ...3 6 Horizontal tab setting 37 Horizontal tab 38 Right margin 65 ...

Page 72: ...40 Page length in lines 4 1 Page length in inches Refer to 3 42 Vertical tab setting Refer to 4 66 ...

Page 73: ...4 3 Channel vertical tab setting 44 Channel selection of vertical tab Refer to 43 67 ...

Page 74: ...45 1 8 inch line feed 46 7 60 inch line feed 47 1 6 inch line feed 88 ...

Page 75: ......

Page 76: ...50 n 120 line spacing 70 ...

Page 77: ...51 Underline 5 2 Buffer clear 5 3 Back space 71 ...

Page 78: ...5 4 8th bit 0 Epson only 55 8th bit 1 Epson only 72 ...

Page 79: ...56 8th bit valid Epson only 57 skip over perforation 73 ...

Page 80: ......

Page 81: ...56 Termination of skip over perforation Refer to 57 59 Data delete 6 0 Home positioning 61 International character Epson only 75 ...

Page 82: ...62 Buzzer 63 Reset 76 ...

Page 83: ...eafter 16 bytes of input data will be printed a line at a time due to the function of the automatic printing provided If the number of input data is less than 16 bytes and it is necessary to print them all press the ON LINE switch After printing push the ON LINE switch again to return to the dump function from the OFF LINE state This function can be terminated by either of the 3 ways shown below 1...

Page 84: ...been damaged by faulty or leaking batteries not supplied by Epson or by accident misuse neglect or improper packing shipping modification or servicing by other than Epson or an authorized Epson Service Center SOME EPSON PRODUCTS HAVE A COMPARTMENT CONTAINING STATIC SENSITIVE ELECTRONIC CIRCUITRY THIS COMPARTMENT IS CLEARLY LABELED DO NOT OPEN IT THIS WARRANTY WILL BECOME VOID IF YOU ATTEMPT TO ADD...

Page 85: ...EPSON EPSON AMERICA INC ...

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