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Home / Products / RF Relays / TSIR04 – 4 Channel Outputs- 4 optically Isolated Inputs USB Relay Module

TSIR04 – 4 Channel Outputs- 4 optically Isolated Inputs USB Relay Module


TSIR04 is a USB relay with optically isolated inputs and OLED display and temperature sensor port.

It allows computer control switching of external devices by using the USB port of your computer. The communication medium also can be changed easily. Replace the USBBee module with a WiFiBee, it becomes a WIFI relay. It will be a Bluetooth relay when you plug a BluetoothBee.

The TSIR04 provides four volt free contact relay outputs with a current rating of up to 10Amp each. The module is powered from a 5V/12V DC power supply. The DC input jack is 2.1mm with positive core polarity, The relays are SPDT types.

Optically Isolated Inputs

TSIR04 has 4 optically isolated input ports. Input voltage absolute max. 30V DC, Operational 4.5V to 27V DC. TSIR0x has 2 working modes:

Normal mode: When the board reads an input signal it recognizes the input state.

Auto mode: When the board reads an input signal it recognizes the input state and turns on the corresponding relay. When the input voltage is removed relay turns off.

OLED display

OLED display shows the current board state. You can check the state no need to connect with your PC.

Current mode: Manual/Auto
Temperature: xxx  degree

Relay power rating

If the relay is used at a voltage or current exceeding this specification, the life of the contacts may be significantly shortened.

A full datasheet for the relays used on the TSIR04 is here: G5LA datasheet

Please choose the correct DC power supply for your board.

First Step – Install the Driver

TSIR04 module uses USBBee module as the USB extension port. USBBee module uses a CP2102 USB to UART chip. Before using it you need to download the CP210x Driver.

Connect the module to the computer’s USB port and windows will detect it and ask for the drivers. Point windows to the inf folder and it will install the driver.

A new com port will now appear

The TSIR04 operates with an easy to use command set as described in the table below.

TSIR04 Baud rate: 9600

Test program
To get the TSIR04 up and running in the minimum amount of time we have put together an example program to demonstrate the functionality of the module.


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