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(2) X ON/X OFF, ETX/ACK system (applicable to RS232C - RD or CD - interface)
When the printer is operated with X ON/X OFF, ETX/ACK system, the following signal lines
necessary:
1) FG (Frame Ground)
Grounding line for circuit protection.
2) SD (Send Data)
This is a serial data transmission line to the host CPU from the printer.
When no data is transmitted, this line must be in "MARK" state.
It goes low when the logic is "0" and high level when the logic is "1".
3) RD (Received Data)
This is a serial data transmission line to the printer from a host CPU. When no data is
transmitted, this line must be in "MARK" state. It goes low level when the logic is "0" and
high level when the logic is "1".
4) RTS (Request to Send)
This is an output signal from the printer, and goes high level when the printer is selected.
5) CTS (Clear to Send)
This is a line for printer input signals.
This line must go high level to allow the printer to send out the data.
6) DSR (Data Set Ready)
This is a signal line to the printer. It must go high level in order to permit the printer to
receive data signals.
7) SG (Signal Ground)
This is a grounding line for signals.
8) CD (Carrier Detect)
This line is used to detect the input signal carrier entering the printer. It is normally ig-
nored. It is not used in this printer.
14) FAULT (Fault)
This signal is low when the printer is abnormal or when deselected. It is high when the
printer is normal and selected.
20) DTR (Data Terminal Ready)
This is a line for the printer output signals.
When power is supplied to the printer and the printer is ready to receive the data, this line
becomes a high level.
Note: The DSR and CTS lines can be isolated for ignorance by switching the jumper line.
(3) Data RDY /BSY system (In case of 20 rnA current loop - CD)
When the printer is operated with this system, the following signal lines are necessary.
1 ) FG (Frame Ground)
Grounding line for circuit protection.
18) CER
(+)
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