Smartfox Pro Charger
The Smartfox Pro Charger (also supplied as the i-CHARGE CION) is an AC EV wallbox designed to integrate with the Smartfox energy management ecosystem for PV-surplus charging and dynamic load management. Over Modbus RTU via RS-485, this template reads the charger operating status and the current charging authorisation state, and writes the enable flag and maximum current setpoint to control active sessions. Connecting these registers to the ModbusCloud Gateway lets installers monitor wallbox state and enforce current limits from a single cloud portal without proprietary software.
- Protocol
- Modbus RTU
- Connection
- RS485
- Registers
- 4, read and write
- Brand
- Smartfox
- Compatible models
- i-CHARGE CION · Pro Charger
- Last updated
Registers (4)
2 read, 2 write
| Name | Unit | Access | Address (Hidden until you enter your email) | Function (hidden) | Type (hidden) |
|---|---|---|---|---|---|
| status | Read | ||||
| enabled | Read | ||||
| enable | Write | ||||
| maxcurrent | A | Write |
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Use cases
- Monitor the charger status register to detect plug-in events and session state changes across multiple sites.
- Track the enabled register to verify that surplus-based charging authorisation toggles correctly during PV production windows.
- Alert when the status register shows a fault code so on-site intervention can be dispatched before the next charging session.
- Compare the maxcurrent setpoint against grid import readings to confirm load management commands were accepted.
- Report charging availability history by logging the enabled register over time to support regulatory or fleet audits.
Installation
Set the Smartfox Pro Charger DIP switches to slave or Modbus-controlled mode as described in the charger installation manual, then assign a unique RS-485 slave address.
Wire the RS-485 A and B terminals of the wallbox to the corresponding terminals on the ModbusCloud Gateway using a twisted, shielded cable pair, keeping the daisy-chain topology.
In the ModbusCloud portal, add a new gateway, import the Smartfox Pro Charger template, and enter the slave unit ID that matches the address set on the charger.
Verify connectivity by reading the status register in the live data view and confirm the value changes when you plug in a vehicle.
Things to watch for
The status register always reads zero. What is wrong?
The Smartfox Pro Charger natively uses 1-based register addressing, while many Modbus drivers use 0-based addressing. If your gateway or tool applies no offset, address 139 in the template maps to physical register 140 in Smartfox documentation. Confirm the offset setting in the ModbusCloud Gateway matches the charger's addressing convention.
Writing the enable register has no effect. How do I fix this?
Verify the DIP switch configuration on the charger controller board is set to external Modbus control mode. If the charger is still in standalone or automatic mode, register writes to address 100 are silently ignored. Consult the charger manual for the correct DIP position that activates remote Modbus authorisation.
No values appear after wiring. Where should I check first?
RS-485 bus issues are the most common cause. Check that A and B terminals are not swapped, the cable is shielded and terminated at both ends if the bus run exceeds a few meters, and only one device is addressed at a time during commissioning. A single wiring reversal on any node silences the entire bus.
Is it safe to write large values to the maxcurrent setpoint register?
Writing a current above the wallbox or circuit breaker rating can trip protection devices, damage the cable, or invalidate the installation warranty. Always stay within the ampere limit defined in your electrical design. Test setpoint changes incrementally and confirm the charger accepts the value before relying on automated writes from the portal.
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