Toshiba B-570 SERIES Owner's Manual page 44

1. OUTLINE OF THE SYSTEM
(9) Pin description
Pin No.
1
FG (Framed Ground)
2
RD (Received Data)
3
TD (Transmit Data)
4
CTS (Clear to Send
RTS (Request to Send)
5
6 DTR (Data Terminal Ready)
7
SG (Signal Ground)
20
DSR (Data Set Ready)
(10) Interface circuit
Input circuit
RD
CTS
DSR
Signal level
Input voltage
Output voltage
Signal
SN75189 or equivalent
"H" ..................... + 3V ~ + 15V
"L" ...................... - 3V ~ -15V
"H" ..................... + 6V ~ + 13V
"L" ...................... - 6V ~ -13V
I/O
-
Ground line for circuit protection.
Data line from which the priter receives data
from the host (receive data line).
I
Logic "1" is "Low", and "0" "High".
It is LOW (MARK) while no data is being sent.
Data line from which the printer sends data to
the host (send data line).
O
Logic "1" is "Low", and "0" "High".
It is LOW (MARK) while no data is being sent.
Input signal from the host.
I
It must be "High" for the printer to send data.
Output signal to the host.
(1) READY/BUSY (DTR) protocol
It indicates there is data to send to the
host.
After power is ON, it is always "High".
(2) READY/BUSY (RTS) protocol
O
Indicates whether the printer is ready to
receive data.
The signal is at the Low level when the
data amount in the data buffer is near
full, and at the high level when near
empty.
Output signal to the host.
(1) READY/BUSY (RTS) protocol
It indicates there is data to send to the
host.
After power is ON, it is always "High".
O
(2) READY/BUSY (DTR) protocol
Indicates whether the printer is ready to
receive data amount in the data buffer is
near full, and at the high level when near
empty.
-
Ground line for all data and control signals.
Input signal from the host.
I
It must be "High" for the printer to receive
data.
Output circuit
TD
RTS
DTR
1-8
(Revision Date: Aug. 5 '99)
1.5 ELECTRONICS SPECIFICATIONS
Description
SN75188 or equivalent
EM10-33006A
Fig. 1-6