Communication Module Connections; Rs-485 Connection - Delta RPI M80U Operation And Installation Manual

3.4 Communication Module Connections

The communication module of M80U provides VCC, RS-485, dry contact, EPO,
and Digital Input terminals for different use.
Dry Contact

3.4.1 RS-485 Connection

The pin definition of RS-485 is shown in the following table. Different RS-485
connection requires different set up for the terminal resistor.
• When single inverter is installed, the terminal resistor on its communication
module should be switched ON.
• When several inverters are cascaded, only the first and the last inverter's
terminal resistors MUST be switched ON.
EPO*1 &
Digital Inputs*6
Figure 3-17 : Communication Module
Terminal Resistor & VCC Switch
VCC & RS-485
33
Installation