The USB-2261C-16 and USB-2261C-32 are USB 2.0 I/O devices with 16 or 32 PhotoMOS Relay. PhotoMOS technology provides a faster response time and greater electrical endurance. The integration of PhotoMOS technology also eliminates potential for arcing, bounce, and switching noise. Both models also have LED indicators to display the status of the digital channels. A dual watchdog function with configurable power-on and safe values ensures reliable operation in harsh environments. We also provide API library and demos with source code for Windows and Linux users to develop their own USB applications with various development tools (VB/C++/C#.NET/VB.NET/LabVIEW).
Therefore, the USB-2261C-16/USB-2261C-32 is the perfect choose for you to implement I/O expansion via a plug-and-play USB interface.

Note：The USB 2.0 port provides only 500mA, external power is required when multiple modules are connected to the same USB port. Please refer to the following figure shown daisy chain application.
 

The modules support dual power inputs (+10 to +30 VDC) for enhanced redundancy. If one source becomes inactive or is interrupted, the other immediately takes over to ensure uninterrupted operation in critical environments. The modules can operate as normal with only a single power source. (If not using the USB hub function, the module can be powered via a USB 2.0 port.)