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Connecting an RS485 Communications Cable
Context
- The SmartLogger can connect to RS485 communications devices, such as a solar inverter, an environmental monitoring instrument (EMI), a power meter, and a PID over the COM port.
- Ensure that RS485+ is connected to COM+ of the SmartLogger and RS485– is connected to the COM– of the SmartLogger.
Procedure
- Connect an RS485 communications cable.Figure 4-2 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 SmartLogger.
- 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 on the SmartLogger.
Figure 4-3 Cascading connection
