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Epson 420i 1. Printer Input Signals, 2. Output Signals from the Printer

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Input/Output Signal Descriptions

1. Printer Input Signals

* RD (RECEIVED DATA)

This line is the data reception line for the serial signals from the computer. The data consists of a start bit, data (parity bit), and stop bit.

Data length 7/8 bits.

With/without parity bit.Selectable by DIP switches Odd/even parity

* CTS (CLEAR TO SEND)

A data transmission control signal, NC (No Connection).

OFF: Data transmission may not be performed.

ON: Data transmission is possible.

* DSR (DATA SET READY)

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 output.

*SRTS

This is a handshaking signal representing the printer’s BUSY state.

OFF: BUSY

ON: READY

* DTR (DATA TERMINAL READY)

This signal controls the state of the modem.

OFF: Modem transmitting/receiving cannot be performed.

ON: Modem transmitting/receiving can be performed.

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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)