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RS485 Protocol C-3
C.3 Installation
C.3.1 Connecting the Communication Line
Step 1. Connect the RS485 communication line to the inverter’s (S+), (S-) terminals
of the control terminals.
Step 2. Check the connection and turn ON the inverter.
Step 3. If the communication line is connected correctly, set the
communication-related parameters as follows:
• P38 [Drive mode]: 3(RS485)
• P40 [Freq. mode]: 7(RS485)
• t60 [Inv. Number]: 1 to 250 (If multiple inverters are connected, be sure to use
different numbers for each inverter)
• t61 [Baud-rate]: 3 (9,600 bps as Factory default)
• t62 [Lost Mode]: 0 - No action (Factory default)
• t63 [Time-Out]: 1.0 sec (Factory default)
• t59 [Comm. Prot]: 0 - Modbus-RTU
C.3.2 Computer and Inverter Connection
The maximum number of drives that can be connected is 31.
The maximum length of communication line is 1200m. To ensure stable
communication, keep the length to less than 700m.
C.4 Operation
C.4.1 Operating steps
Step 1. Check whether the computer and the inverter are connected correctly.
Step 2. Turn ON the inverter. But do not connect the load until stable communication
between the computer and the inverter is verified.
Step 3. Start the operating program for the inverter from the computer.
Step 4. Operate the inverter using the operating program for the inverter.
Step 5. Refer to Chapter 9: Troubleshooting if the communication is not operating.