(14)Input/Output Signals

Printer

FG

TD

RD

RTS CTS

DSR

SG

DTR

Host

(15) Connector Pin Assignment and Signal Description

Pin No.

Signal

Function

Signal Direction

 

Name

 

 

 

 

 

 

1

FG

z Ground line for circuit protection

 

2

RD

z Line for data which the printer receives from the host.

Host

 

 

z Logic 1 is a Low level, while logic 0 is a High level.

 

 

 

z It is in the Low (Mark) state when no transmission is in

 

 

 

progress.

 

3

TD

z Line for data which the printer sends to the host.

Printer

 

 

z Logic 1 is a Low level, while logic 0 is a High level.

 

 

 

z It is in the Low (Mark) state when no transmission is in

 

 

 

progress.

 

4

CTS

z It is an input signal indicating whether or not the data

Host

 

 

transmission to the host is possible. However, this

 

 

 

printer does not detect this signal.

 

5

RTS

z Output signal to the host.

Printer

 

 

For the READY/BUSY (RTS) protocol:

 

 

 

z It indicates the ready state for the received data.

 

 

 

z It is at “Low” when the receive buffer is nearly full, and at

 

 

 

“High” when nearly empty.

 

 

 

For protocol other than the READY/BUSY (RTS) protocol:

 

 

 

z After the power is turned on, it is always at “High” level.

 

6

DTR

z Output signal to the host.

Printer

 

 

For the READY/BUSY (DTR) protocol or XON/XOFF

 

 

 

(DC1/DC3) protocol + READY/BUSY (DTR) protocol:

 

 

 

z It indicates the ready state for the received data.

 

 

 

z It is at “Low” level when the receive buffer is near full, and

 

 

 

at “High” level when near empty.

 

 

 

For the XON/XOFF (DC1/DC3) protocol or READY/BUSY

 

 

 

(RTS) protocol:

 

 

 

z After the power is turned on, it is always at “High”.

 

7

SG

z Ground line for all data and control signals.

 

20

DSR

z Input signal from the host.

Host

 

 

z For the printer to receive data, it must be at “High” level.

 

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Toshiba B-SX4T-GS20-QM-R manual Input/Output Signals Printer, Rts Cts Dsr Dtr