WBE-DO-OC-2: Dual Open-Collector Output Module

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The module is designed to control dry contact inputs, as well as for switching low-voltage load.

Output contact diagram

Технические характеристики

WBE-DO-OR-2 for Wiren Board 5

The module contains two N-channel transistors with common ground.

Each channel has built-in protection against voltage surges when switching inductive load (TVS for 30V).

The ground (GND) of the load must be connected to the GND terminal of the module (O3 terminal of the extension module).

Parameter Value
Number of outputs 2
Output type N-channel field effect transistor

(open collector)

Contact configuration SPST (normally open)
Maximum switching voltage 30V DC
Maximum switching current, per channel 2A'
The channel resistance in the open state 40 mOhm
Voltage isolation between the controller and the output no
Maximum power consumption 0.01 W
Compatibility Compatible with Wiren Board 5 of all revisions.

Can be installed into both extension slots.


Terminal Function
O1 K1
O2 K2


Configuration of the web interface is carried out in the section Configs => Hardware Modules Configuration.

Select "WBE-DO-OC-2: Dual Open-Collector Output Module" in the Internal slot 1 or 2 section (depending on the slot number) and click Save.

Once added, two additional outputs appear in the Devices next to the controller outputs (the Discrete I/O section).

When adding a device is detected immediately, a reboot is not required.


Slot Terminal Output Channel (MQTT) Topic (MQTT)
MOD1 O1 K1 wb-gpio/MOD1_K1 /devices/wb-gpio/controls/MOD1_K1
O2 K2 wb-gpio/MOD1_K2 /devices/wb-gpio/controls/MOD1_K2
MOD2 O1 K1 wb-gpio/MOD2_K1 /devices/wb-gpio/controls/MOD2_K1
O2 K2 wb-gpio/MOD2_K2 /devices/wb-gpio/controls/MOD2_K2


LED connection example
Relay connection example

The load is connected as follows: "plus" load is connected to the power supply, "minus" is connected to the transistor output. For the load to start working, you need to apply a high level to the gate of the transistor.

The illustrations show the wiring diagrams of the LED and relay.

Technical details

The relay control signals are on the SDA (K1) and SCL (K2) contact of the extension module.