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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.