Fuji Electric FRENIC-AQUA series, User Manual

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8.1 Overview on RS-485 Communication
8-1
Chap. 8
RUNNI
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RS-4
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COMMUNI
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TION
8.1 Overview on RS-485 Communication
The FRENIC-AQUA has two RS-485 communications ports at the locations shown below.
(1) Communications port 1: RJ-45 connector for the keypad (modular jack)
(2) Communications port 2: RS-485 terminals (Control circuit terminals SD, DX-, and DX+)
COM port 1 COM port 2
Using the RS-485 communications ports shown above enables the extended functions listed below.
„ Remote operation from a keypad at the remote location (COM port 1)
Using an extension cable to connect the standard keypad to the RJ-45 port allows you to mount the
keypad on a panel located far from the inverter, enabling remote operation. The maximum length of
the extension cable is 20 m.
„ Operation by FRENIC Loader (COM ports 1 and 2)
A Windows-based PC can be connected to the RJ-45 connector (RS-485 communication, COM port
1) or the USB port on the inverter. Through the interface, you can run FRENIC Loader (see Section
8.2) on the PC to edit the function code data and monitor the running status of the inverter. Connecting
the PC to the RS-485 connector (COM port 2) on the terminal block also allows you to run FRENIC
Loader.
„ Control via host equipment (COM ports 1 and 2)
Connecting the inverter to a PC, programmable logic controller (PLC), or other host equipment
enables you to control the inverter as a subordinate device from the host.
Besides the communications port (RJ-45 connector) shared with the keypad, the FRENIC-AQUA has
RS-485 terminals as standard. The connection via terminals facilitates multi-drop connection.
Protocols for managing a network including inverters include the Modbus RTU, Metasys N2, BACnet
and communications link pump control protocols that are widely used in FA markets, as well as the
Fuji general-purpose inverter protocol that supports the FRENIC-AQUA and conventional series of
inverters.
• Connecting the keypad to the COM port 1 automatically switches to the keypad protocol;
there is no need to modify the function code setting.
• When using FRENIC Loader, which requires a special protocol for handling Loader
commands, you need to set up some communications conditions accordingly.
For details, refer to the FRENIC Loader Instruction Manual.
• The COM port 2 supports only controls from host equipment, and not from the keypad.
For details of RS-485 communication, refer to the RS-485 Communication User's Manual.
RJ-45 connector
RS-485 terminals (SD, DX-, and DX+)
(which facilitate multi-drop connection.)