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Connecting the RS485 Communications Cable
Context
- The SmartModule can connect to RS485 communications devices, such as a solar inverter, an EMI, a power meter, and a PID over COM ports.
- Ensure that RS485+ is connected to COM+ of the SmartModule and RS485– is connected to the COM– of the SmartModule.
Procedure
- Connect the RS485 communications cable.Figure 4-17 Connecting an RS485 communications cable
Port
Silk Screen
Description
COM1, COM2, and COM3
+
RS485A, RS485 differential signal+
–
RS485B, RS485 differential signal–
- If devices need to be cascaded, cascade the devices and then connect them to the SmartModule.
- You are advised to connect fewer than 30 devices to each RS485 route.
- The baud rate, communications protocol, and parity mode of all devices on an RS485 cascading link must be the same as those of the COM port of the SmartModule.
Figure 4-18 Cascading connection
