RTS - Request To Send - (Pin 4) This output is always held high (above 3 volts). CTS - Clear To Send - (Pin 5) DSR - Data Set Ready - (Pin 6) Unused. SG -
Signal Ground - (Pin 7) All signals can transmit between the printer and the host computer to send each signals with a signal ground. 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 undefined.
C-4 C.2. RS-232C/RS-422A Interface 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: Ì 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. Ì Touch
the main circuit board only by the edge. Withdrawing the Main Circuit Board from the Printer Be sure to remove the memory card first if inserted in the
printer's memory card slot. Withdraw the main circuit board completely from the printer as follows: 1.
Turn the printer's power off. Unplug the printer's power cable and disconnect the printer from the host computer. 2. Remove the three screws from the
printer's rear cover. Power OFF (O) C-5 C.
2. RS-232C/RS-422A Interface 3. Pull the main circuit board all the way out of the printer. Before pulling the main board out, clean an area on the table, etc.,
at the back of the printer's rear panel. Foreign objects, accidentally sticking to the back of the main board, can cause serious damage to the printer. Jumper
Connector Changing the Jumper Connector 1. Carefully remove the jumper connector from the main circuit board, and reconnect to the pin position shown in
the diagram. Jumper Connector 2. After completion of the above, return the main circuit board to the printer by reversing the procedure followed when
removing it.
Verifying the Setting The procedure described below should be followed to verify that the RS-422A mode had been correctly set. Print the service status page
to verify that the RS-422A mode has been correctly set. 1. Make sure the power switch is off. Plug the power cord into the printer and turn power on. 2. If the
printer is on-line, selectý!!3ULQW 6WDWXV SDJH in the Mode Select menu (refer to Mode Select Menu at the end of this document), and print the service
status page. 3. Verify whether the setting is correct by checking the status printed at the bottom of the page. The following sample indicates that "RS-422A" is
set "RS4".
If "RS-232C" is set, "RS2" appears. [Printer Status Page] Indicates the current serial interface mode. C-6 C.2. RS-232C/RS-422A Interface Interface Signals
The pins in the printer's RS-422A interface connector carry the signals listed in Table C.
3. Table C.3. RS-422A Signal Pin Assignments Pin 1 3 7 9 10 18 In/out In Out Out In Signal FG RDA SG SDA SDB RDB Description Frame ground Receive
data Inverted Signal ground Send data Inverted Send data Receive data Overview of Signals (RS-422A) FG - Frame Ground - (Pin 1) This pin is connected
directly to the printer frame.
You're reading an excerpt. Click here to read official KYOCERA
FS-1750 user guide
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