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9.1 Overview of RS-485 Communication
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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
.
Содержание FRENIC-Ace series
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