Input/Output Signals; Connector Pin Assignment And Signal Description - Toshiba B-SX4T Series Specification

(14) Input/Output Signals

Printer

(15) Connector Pin Assignment and Signal Description

Signal
Pin No.
Name
1 FG
2 RD
3 TD
4 CTS
5 RTS
6 DTR
7 SG
20 DSR
FG
TD
RD
RTS
CTS
DSR
SG
DTR
Ground line for circuit protection
Line for data which the printer receives from the host.
Logic 1 is a Low level, while logic 0 is a High level.
It is in the Low (Mark) state when no transmission is in
progress.
Line for data which the printer sends to the host.
Logic 1 is a Low level, while logic 0 is a High level.
It is in the Low (Mark) state when no transmission is in
progress.
It is an input signal indicating whether or not the data
transmission to the host is possible.
printer does not detect this signal.
Output signal to the host.
For the READY/BUSY (RTS) protocol:
It indicates the ready state for the received data.
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:
After the power is turned on, it is always at "High" level.
Output signal to the host.
For the READY/BUSY (DTR) protocol or XON/XOFF
(DC1/DC3) protocol + READY/BUSY (DTR) protocol:
It indicates the ready state for the received data.
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:
After the power is turned on, it is always at "High".
Ground line for all data and control signals.
Input signal from the host.
For the printer to receive data, it must be at "High" level.
Function
- 11 -
Host
Signal Direction
← Host
Printer →
← Host
However, this
Printer →
Printer →
← Host