Star Micronics SP2000 User Guide

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APPENDIX

B-1. Pins and Signal Names

Pin No.

Signal Name

Direction

Function

—

Frame ground

TXD

OUT

Transmission data

RXD

Receive data

RTS

OUT

When Memory Switch 4-D = 0: Same as DTR signal
When Memory Switch 4-D = 1: Always SPACE

N.C.

Not connected

DSR

• DIP Switch 2-7 = OFF
STAR Mode
Status of this signal is not checked.
ESC/POS Mode
In DTR/DSR communication mode when Memory Switch4-5 = 0,
indicates whether data receive from host is enabled or disabled.
Space: Receive enabled
Mark: Receive disabled
In DTR/DSR communication mode when Memory Switch 4-5=1,
status of this signal is not checked.
This signal is not checked in the X-ON/X-OFF communication
mode.

• DIP Switch 2-7 = ON
This signal used for external reset. Printer is reset whenever signal
is in mark state with pulse width of 1mS or more.

Signal ground

8 -19

N.C.

Not connected

DTR

OUT

Indicates whether data receive from host is enabled or disabled.
DTR/DSR Communication Mode
Space when receive is enabled.

Appendix B: Serial Interface

Printer status

DIP switch 1-2

1. During the period from when the power is

turned on (including resetting using the in-
terface) to when the printer is ready to re-
ceive data.

2. During self printing and dot alignment ad-

justment.

3. During paper feeling using the paper feed

button (ESC/POS mode only).

4. When the printer stops printing due to a

paper end or a paper near end.

5. When an error has occurred.

6. When the receive buffer becomes full.

BUSY

—

BUSY

—

BUSY

—

BUSY