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Epson 420i OFF, Mark, Space, -3V~-15V, +3V ~ +15V, • Input signal, •Output signal, 1. Signal Level, 1. READY/BUSY Protocol, 2. X-ON /X-OFFProtocol

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Electrial Conditions

1. Signal Level

ON	Space	+3V ~ +15V
OFF	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, transmission 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

Contents

Page HIGH SPEED BUSINESS PRINTER WARNING: •Reorient the receiving antenna •Relocate the computer with respect to the receiver •Move the computer away from the receiver “How to Identify and Resolve Radio-TVInterference Problems.” INTRODUCTION PRECAUTIONS FOR USE CONTENTS OUTLINE Page 6.Paper Feed Function and Form Width 7. Line Feed Pitch 8. Line Feed Speed 9. Copies 10. Ribbon SWITCHES AND LAMPS 8.RESET Switch 9.POWER Lamp (Green) Lights up when power is on. Blinks if an error has been generated 10. ON-LINELamp (Green) 11. P. EMPTY Lamp (Red) RIBBON CASSETTE REPLACEMENT Fig Page Page PAPER SETTING Page Fig 7.Push the paper pressure bar towards the platen Note 1: Recommended paper position is shown below CORRECTINCORRECT 2.Insert the form as done for path 2 of Fig 3.Move the tractor lock lever upward. (Fig. 11) 4.Perform steps 5-8for the rear feed tractor type (path 1) MAIN FUNCTIONS it was prior to printing except when the function is cleared Example: (STANDARD) Page Page (performed only during the initialization operations) PARALLEL INTERFACE (a)While performing initialization operations (a) (b)While the printer is inputting data with the STROBE signal (b) (c)During self test printing 2.Input / Output Conditions 3. Signal Cable Length (a) Data input (b) Initialization SERIAL INTERFACE 1. Printer Input Signals 2. Output Signals from the Printer 1. Signal Level Space +3V ~ +15V Mark -3V~-15V 3. ETXlACK Protocol The following four baud rates are selected by DIP switches SW1 SW1-7 No parity DIP SWITCH SETTING Page * Skip-overPerforation Selection Skip Perforation Skip-overperforation * Operating Mode Selection Printer Mode International Characters CODE TABLE Page CODE TABLE (IBM CHARACTER SET 2) CONTROL CODE SUMMARY Page Page ing to 1/16-inch The command selects PRINT MODE FLOWCHART CONTROL CODE EXPLANATION 6. (1B, 50)H (27, 80)D, (9B, D0)H (155, 208)D 7. (1B, 4D)H (27, 77)D, (9B, CD)H (155, 205)D 8. (0F)H (15)D, (8F)H (143)D 9.(1B, 0F)H (27, 15)D, (9B, 8F)H (155, 143)D 10. (1B, 70, n)H (27, 112, n)D, (9B, F0, n)H (155, 240, n)D 15. (1B, 21, n)H (27, 33, n)F Style Value Pica Elite 19. (1B, 48)H (27, 72)D, (9B, C8)H (155, 200)D This code terminates double-strikemode 20.(1B, 58, n)H (27, 88, n)D, (98, D8, n)H (155, 216, n)D This code selects high quality (correspondence) print mode n = (01)H or (31)H Selects high quality print mode 28. (14)H (20)D, (94)H (148)D This code terminates the double-widthprint mode 29. (1B, 57, n)H (27, 87, n)D, (9B, D7, n)H (155, 215, n)D n = (01) or (31) 32.(1B, 6B, n1, n2)H (27,107, n1, n2)D, (9B, EB, n1, n2)H (155, 235, n1, n2)D 33. (1B, 2A, 6D, n1, n2)H (27, 42, 109, n1, n2)D 34. (1B, 59, n1, n2)H (27, 89, n1, n2)D 35.(1B, 5A, n1, n2)H (27, 90, n1, n2)D 36.(1B, 44, n1, n2, .... nk, 00)H (27, 68, n1, n2 . . . nk, 0)D, (9B, C4, n1, n2, .... nk, 00)H, (155, 196, n1, n2, .... nk, 0)D l [ k n ranges 39. (1B, 6C, n)H (27,108, n)D, (9B, EC, n)H (155, 236, n)D If the left and right margins overlap, the one input first is considered valid The length of the page at power-onis selected by the FORM switch 40.(1B, 43, n)H (27, 67, n)D, (9B, C3, n)H (155, 195, n)D 1 n [ 127. If n [ 128, this is ignored 44. (1B, 2F, m)H (27, 47, m)D, (9B, AF, m)H (155, 175, m)D set by are used. The 45. (1B, 30)H (27, 48)D, (9B, B0)H (155, 176)D This code sets the line-feedpitch to 1/8 inch 52. (18)H (24)D, (98)H (152)D 53. (08)H (08)D, (88)H (136)D (1B, 3D)H (27, 61)D (Epson mode only) (1B, 3E)H (27, 62)D (Epson mode only) (1B, 23)H (27, 35)D (Epson mode only) 59. (7F)H (127)D, (FF)H (255)D portional print mode 60. (1B, 3C)H (27, 60)D, (9B, BC)H (155, 188)D This code moves the print head to the home position (1B, 52, n)H (27, 82, n)D (Epson mode only) 64.(1B, 55, n)H (27, 85, n)D, (9B, D5, n)H (155, 213, n)D n = (01)H or (31)H Selects unidirectional printing n = (00)H or (30)H Selects bidirectional logic seeking printing 65. (1B, 38)H (27, 56)D 66. (1B, 39)H (17, 57)D PROGRAM EXAMPLES Page Page Page Page 1 4 .Termination of superscript/subscript Refer to 16.Bold Bold 18.Double-strike Page Page Page Double-width Double width High density graphic Page Page Horizontal tab Page Page Page Page Page 51.Underline Buffer clear Page 8th bit valid (Epson only) Page 56.Termination of skip-overperforation Refer to 61.International character (Epson only) 62.Buzzer 63.Reset APPENDIX Epson America, inc Service Division 23610 Telo Avenue Torrance, CA (213)