TEC B-450 SERIES, User Manual

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1-8
1. OUTLINE OF THE SYSTEM EO10-33003A
(9) Pin description
Pin No.
2
3
4
5
6
7
8
Signal
TD
(Transmit Data)
RD
(Received Data)
DSR
(Data Set Ready)
SG
(Data Set Ready)
DTR
(Data Terminal
Eeady)
CTS
(Clear to Send)
RTS
(Request to Send)
I/O
O
I
I
-
O
I
O
Description
Data line from which the printer sends data to the
host (send data line).
Logic "1" is "Low", and "0" "High". It is LOW (MARK)
while no data is being sent.
Data line from which the printer receives data from
the host (receive data line).
Logic "1" is "Low", and "0" "High". It is LOW (MARK)
while no data is being sent.
Input signal from the host.
It must be "High" for the printer to receive data.
Ground line for all data and control signals.
Output signal to the host.
When controlling the READY/ BUSY (DTR):
• Indicates that the printer is ready to receive data.
• When the receive buffer is nearly full, it is "Low",
and when the buffer is nearly empty, it becomes
"High".
When controlling the READ/BUSY (RTS):
After power is ON, it is always "High".
Input signal from the host.
It must be "High" for the printer to send data.
Output signal to the host.
When controlling the READY/BUSY (DTR):
• Indicates there is data to send to the host.
• After power is ON, it is always "High".
When controlling the READY/BUSY (RTS):
• When the receive buffer is nearly full, it is "Low",
and when the buffer is nearly empty, it becomes
"High".
1.5 ELECTRONICS SPECIFICATIONS