5.1 Overview on RS-485 Communication
5-3
Chap. 5 RUNNING THROUGH RS-485 COMMUNICATIONS
5.1.2 Connector specifications
The RS-485 communications port uses an RJ-45 connector whose pin assignment is listed in the table
below.
Pin Signal name Function Remarks
1 and 8 Vcc Power source for the remote keypad 5V
2 and 7 GND Reference voltage level GND
3 and 6 NC No connection --
4 DX- RS-485 communication data (-)
5 DX+ RS-485 communication data (+)
Built-in terminating resistor:
112 Ω
Open/close switchable by
SW3
The RJ-45 connector has power source pins (pins 1 and 8) designed for the remote keypad.
When connecting other devices to the RJ-45 connector, take care not to use those pins.
For the details about the terminating resistor switch, refer to the FRENIC-Mini Instruction
Manual, Section 2.3.7 "Setting up the slide switches."
When connecting a remote keypad, it is not necessary to turn the terminating resistor switch
ON.
RJ-45 connecto
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