Y&H HSI 5000U / SRNE Solar Inverter Monitor for Arduino R4

Based on SRNE Modbus RTU protocol

Hardware

• RS485 to TTL converter module (auto-direction type with TX/RX only)

Connections

Y&H RJ45 to RS485 Module

• Y&H RJ45 Pin 7 (RS485-A) → RS485 Module A
• Y&H RJ45 Pin 8 (RS485-B) → RS485 Module B
• Y&H RJ45 Pin 1 (GND) → RS485 Module GND & Arduino GND

RS485 Module to Arduino

• RS485 Module VCC → Arduino 5V
• RS485 Module RX → Arduino Serial1 TX (Pin 1)
• RS485 Module TX → Arduino Serial1 RX (Pin 0)

Arduino IoT Cloud Variables Required

Variable	Type	Access	Callback
batteryCurrent	CloudElectricCurrent	Read	-
pvCurrent	CloudElectricCurrent	Read	-
batteryVoltage	CloudElectricPotential	Read	-
pvVoltage	CloudElectricPotential	Read	-
batterySOC	int	Read	-
loadPower	CloudPower	Read	-
pvPower	CloudPower	Read	-
takeSnapshot	bool	Read & Write	onTakeSnapshotChange
compareSnapshot	bool	Read & Write	onCompareSnapshotChange

Control

Control everything via Arduino IoT Cloud dashboard!