Star Micronics SP300 Series manual Data Structure, DTR mode

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2-6. Data Structure

2-6-1. DTR mode

This mode is accessed when the DIP switch 3-5 is ON. Signals are controlled using the DTR line as BUSY flag.

RXD		Data

Buffer full

DTR

Printing

Data

Buffer empty

Data

Power ON

When paper is out

RXD

OFF LINE

ON LINE

DTR

Printing

Paper out

PAPER OUT signal

Power ON

Press the ON LINE switch after loading paper.

If a printer errors do not occur after the power is turned on, the DTR signal line changes to “SPACE”.

When the host computer confirms that the DTR signal line is set to “SPACE”, the host computer sends the data text via the RXD signal line to the printer. Also, the printer will set the DTR signal line to “MARK” when the empty space in the data buffer is below 256 bytes. After the host computer detects that the DTR signal line is at “MARK”, transmission of the data text is sopped. In this instance, data can still be received up until the data buffer becomes completely full.

When the empty space in the data buffer is increased following printing (when the data in the data buffer is reduced to 256 bytes or less), the printer sets the DTR signal line to “SPACE”.

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Contents Dot Matrix Printer SP300 Series Programmer’s Manual Page Table of Contents IBM Character Set #1 DIP SW2-1 OFF, SW2-2 on LED flashes Validation printing mode is set Basic OperationSwitch Operation Combined Switch Operation Self Print TestMicro Feed Feed + on Line + Power on Page Page Selectable. Refer to Installation Interface SpecificationsTo Installation Manual Parity bit Odd, even or noneInput RXD, CTS Output DTR, FAULT, TXD, RCH, RTSInterface Circuit Input TTY-RXD, TTY-RXDRInput RD, RS Output SD, CSConnectors and Signals RS-232CMA current loop option RS-422A optionInterface Connections Example of interface connections for IBM PCInstalling the Optional Interface Board Installing the optional interface boardDTR mode Data StructureDTR Mark DTR Space ON/X-OFF mode This mode accessed when the DIP switch 3-5 is OFFOFF Status STX-ETX mode Page STX-ETX mode flow diagram for host computer Pulses Handshaking Busy signalsInterface Timing Logic level Compatible with TTL levelTypical interface circuit This connector mates with an Amphenol 57-30360 connectorEmergency Suspension Operating Method This printer can print one line of validation printingOther Printing FormatData format GS data LFAuto cutting control codes Cutting MethodCutting position Other position to be observedControl Codes Used for Character Setting Control Codes Used for Line SpacingControl Codes Used for Page Layout Control Code Used for Graphics PrintingControl Codes Used for Download Characters Control Codes Used for Peripheral Units Other Control CodesFunction Function Function Function Control Codes Used for Line Spacing Set 1/8-inch line feed ESC 0 1BH 30H Sets page length at n inchesSet vertical tab positions Left end Printing area Left margin n Right margin n columns Set horizontal tab position Control Codes Used for Graphics Printing Set n/216-inch line feed simulation ESC 3 n 1BH 33H n Example Printing Possible Code Outline When the 5 × 9 font is set Definition of download charactersCode Outline Example Example of transmitting data 10 × n1 ms 10 × n2 ms Printing and paper feed are prohibited Other Control Codes Function Initialize printer ESC @ 1BH 40H ETX 03HFunction Character Code Tables U.S.A. & Europe DIP SW2-1 ON, SW2-2 onPage IBM Character Set #1 DIP SW2-1 OFF, SW2-2 on Page IBM Character Set #2 DIP SW2-1 ON, SW2-2 OFF Page Japan DIP SW2-1, OFF, SW2-2 OFF Page International Character Sets Memo Page Overseas Subsidiary Companies Star Micronics AMERICA, INC