Fuji Electric FRENIC-Ace series - Terminal Specifications; Communication Port 1 (for Connecting the Keypad)

9.1 Overview of RS-485 Communication
9-3
COMMUNICATION FUNCTIONS
Chap 9
9.1.2 Terminal specifications
[ 1 ] RS-485 communication port 1 (for connecting the keypad)
The port designed for a standard keypad uses an RJ-45 connector having the following pin assignment:
Pin Signal name Description
1 Vcc Power source for the keypad (5 V)
2 GND Ground signal
3 NC Not connected
4 DX- RS-485 signal, low side *2
5 DX+ RS-485 signal, high side *2
6 NC Not connected
7 GND Ground signal
8 Vcc Power source for the keypad (5 V)
RJ-45 connector
RJ-45 connector
Terminating
resistor
* The terminating resistor 112 Ω is built in. Open/close with SW2. *
For details about SW6, refer to Chapter 2, “2.2.8 Operating various switches.”
The power supply for keypad is available in the RJ-45 connector for RS-485 communication (Pins 1, 2,
7, and 8). When connecting other devices to the RJ
-
45 connector, take care not to use those pins. Use
pins
4 and 5 only.