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Terminal Resistor

120Ω(1/2W)

DATA+ to DATA-

120Ω(1/2W)

DATA+ to DATA-

RS485/USB

RS485/RS232

Data Format:

Baud rate: 9600, 19200 (default), or 38400

Data bits: 8

Stop bit: 1

Parity: N/A

4.4.1. RS-485 Connection

The pin definition of RS-485 is shown in table 4-5. Different RS-485

connection needs different set up of the terminal resistor.

• When single inverter is installed, the terminal resistor on its communication

module should be switched ON.

• When multi-inverters in chain as shown in Figure 4-7, only the first and

last inverter’s terminal resistor must be switched ON.

Please refer to table 4-6 for the terminal resister setting.

Pin Function

1 VCC (+12V)

2 GND

3 DATA+

4 DATA-

5 DATA+

6 DATA-

Table 4-5 Definition of RS 485 pin

Figure 4-7 Multi-inverter connection illustration

Wiring

Delta RPI-M20A User Manual

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