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Use your computer’s UP/DOWN arrow keys to move through the PLC/Device Protocol List. Place the
highlight bar on the desired Protocol and press the ENTER key. The software will enter this selection
and automatically close the Protocol selection window. After the selection window closes, you will need
to check the communications setting for the selected Protocol, making changes as necessary.
2 Wire RS422 or RS485 Communications
This box will only need to be checked if the communications with your PLC/Device is a 2-wire RS485 or
RS422 interface. When 2-wire communications are being used, RTS must be looped back to CTS on the
DN-3000 side of the cable. This can be done on the RS232 side by looping pins 4 and 5 or on the
RS422/485 side by looping 16 to 18 and 17 to 19.
DN3000 Address
Some PLC/Device protocols require each PLC or Device on a network to be assigned a unique address.
The DN3000 Address is the address assigned to the DN-3000 on the PLC/Device network.
Communications Settings
The communications settings are automatically set to the default values for each type of PLC/Device
when its Protocol is first selected. Before changing any of these settings, consult your PLC/Device
manual for the correct settings. To move between the communications settings, press the TAB or
ENTER keys. To select a setting, use the UP/DOWN arrow key to move to the desired setting and press
the SPACE BAR to enter or change your selection.
RTS Control (Request to Send Control)
RTS Control selection is an option provided for modems or for PLCs/Devices that require RTS to be
active only while the DN-3000 is transmitting to the PLC. If RTS/CTS is selected, the DN-3000 will
activate RTS and wait until CTS is active before transmitting to the PLC. If RTS Delay is selected, the
DN-3000 will activate RTS and wait for the specified delay time to pass before transmitting to the PLC.
Response Time-Out
The Response Time-Out tells the DN-3000 how long to wait after transmitting a request to a PLC/Device
if no response has been received from the PLC/Device. After this amount of time (specified in
milliseconds) passes with no response being received, the DN-3000 will assume that no response is
coming and will retry the request.
To save the configuration for Port #1, press the “Alt+S” keys or the F10 function key once and a small
window appears stating the information was saved. Press the ENTER key, then the ESC key to return to
the “EDIT” window.