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C.2. RS-232C/RS-422A Interface
C-6
DTR - Data Terminal Ready - (Pin 20)
This output is used as a buffer nearly-full handshake line. It is held high (above 3 volts) when the
buffer can accept more data.
RS-232C Interface Voltage Levels
The voltage levels of the interface signals conform to EIA RS-232C specifications. SPACE is from 3
volts to 15 volts. MARK is from -3 volts to -15 volts. Voltages between -3 volts and 3 volts are unde-
fined.
RS-422A interface
The serial interface of this printer was set to RS-232C mode before leaving the factory. However,
by changing the jumper connector on the main circuit board, the interface can be changed to
RS-422A mode.
In RS-232C mode, the printer can be connected to a personal computer (or similar device)
equipped with an RS-232C serial interface. (The serial interface is set to RS-232C before leaving
the factory.)
In RS-422A mode, the printer can be connected to a personal computer (or similar device)
equipped with an RS-422A serial interface.
The changing of the main circuit board jumper connector should be carried out
only by a Kyocera authorized dealer or Kyocera certified technician. Kyocera shall
not be liable for damage due to improper changing of this main circuit board
jumper connector.
Removing the Main Circuit Board
The following instructions are intended for the technician only.
Notes on Handling the Main Circuit Board
Protect the electronics by taking these precautions:
Before touching the main circuit board, touch a water pipe or other large metal object to
discharge yourself of static electricity. While doing the work, it is recommended that you
wear an antistatic wrist strap.
Touch the main circuit board only by the edge.
142


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