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Serial interface, Appendix d: interface, D-1. serial interface – Star Micronics SP298 Series User Manual

Page 134: Pins and signal names

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131

APPENDIX

Appendix D: Interface

D-1. Serial Interface

Pins and Signal Names

Pin
No.

Signal

Name

Direction

Function

1

FG

Frame ground

2

TXD

OUT

Transmission data

3

RXD

IN

Receive data

4

RTS

OUT

STAR Mode

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

ESC/POS Mode

Same as DTR signal

5

N.C.

Not connected

6

DSR

IN

• DIP Switch 9 = 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
This signal is not checked in the X-ON/X-OFF communication mode.

• DIP Switch 9 = ON

This signal used for external reset. Printer is reset whenever signal is in mark
state with pulse width of 1mS or more.

7

SG

Signal ground

8 -19

N.C.

Not connected

20

DTR

OUT

Indicates whether data receive from host is enabled or disabled.

DTR/DSR Communication Mode

Space when receive is enabled.

X-On/X-Off Communication Mode

Always space, except during following conditions:
• Period between reset and communication enabled
• During self-test printing and dot alignment adjustment

21 - 24 N.C.

Not connected