OBO Ion Wallbox

Use cases

• Monitor CP state and advertised current on a live dashboard to verify correct EV charging operation.
• Set the active charging current remotely to implement simple load management across multiple wallboxes.
• Create an alert when an error code is reported, such as a DC residual current fault or failed diode check.
• Configure fallback current and power loss behavior to ensure safe operation if communication is interrupted.
• Log historical charging current data to analyze energy usage patterns for billing or optimization.
• Disable charging remotely during peak tariff hours and re-enable it during off-peak periods.

Installation

1. 1Connect the RS485 A and B wires from the OBO Ion Wallbox to the corresponding terminals on the ModbusCloud gateway (MCG or MLP series).
2. 2Verify that the wallbox Modbus address is set to 101 (default), or adjust it to match the address configured in the template.
3. 3Ensure the gateway serial port is configured for 19200 baud, even parity, and 8 data bits to match the wallbox defaults.
4. 4Import the OBO Ion Wallbox template from the ModbusCloud template library into your project.
5. 5Confirm communication by checking that the CP state and advertised current registers return valid values on the ModbusCloud dashboard.
6. 6Set the communication timeout (register 28) and fallback current (register 30) to appropriate values for your installation.

Things to watch for

01

The gateway cannot communicate with the Ion Wallbox. What should I check?

Verify that the baud rate is set to 19200, parity is set to even, and the Modbus address matches 101 (0x65). Also confirm correct RS485 wiring with A and B lines not swapped.

02

What happens if the Modbus connection between the gateway and the wallbox is lost?

The wallbox will fall back to the current defined in the fallback current register (address 30) after the communication timeout (address 28) expires. You can also configure whether charging continues or stops after power loss using the charge disable behavior register (address 13).

03

Can I use this template for all Ion Wallbox variants?

Yes. The template is compatible with the Ion Wallbox Basic, Ion Wallbox Key, Ion Wallbox Basic Protect, and Ion Wallbox Key Protect. All share the same Modbus register map.

04

What do the error codes mean?

The error code register can indicate a failed diode check, a DC residual current fault, or an RCM self test failure. Refer to the OBO Bettermann documentation for the specific numeric values and recommended actions.

Registers (8)

8 read / 5 write

More RTU templates

Alnor HRU-P

Alnor Systemy Wentylacji Sp. z o. o.

Modbus RTU

Controls Alnor HRU-P heat recovery ventilation units via Modbus RTU.

49 registers7

Alnor HRU

Alnor Systemy Wentylacji Sp. z o. o.

Modbus RTU

Controls and monitors Alnor heat recovery ventilation units via Modbus RTU.

29 registers13

Wattsonic - Schmachtl Sun Energy Box

Wattsonic

Modbus RTU

Monitors Schmachtl Wattsonic hybrid inverter via Modbus RTU

92 registers72

Heidelberg Wallbox Energy Control

AMPERFIED GmbH

Modbus RTU

Controls and monitors Heidelberg Wallbox Energy Control EV charger via Modbus RTU.

22 registers67

connecdoor.controller

connecdoor

Modbus RTU

Controls and monitors smart door access points via RS485

0 registers53

Belimo Air-Water Actuator Modbus RTU

Belimo

Modbus RTU

Controls communicative damper and valve actuators via Modbus RTU.

20 registers46