STU-540 / STU-541 difference

Q: What differences are there between the STU-540 and the STU-541?

1. TLS Encryption:

The STU-541 uses TLS encryption for maximum security between the device and the PC. In the STU SDK this requires special programming which is only available through C++ and Java.
Please note that STU SDK sample code for signature capture with the STU-541 is not provided with the standard samples, instead it can be found in the following two locations in the GitHub sample folders:

• cpp\samples\DemoButtons
• Java\samples\DemoButtons

2. On-board ROM images:

The STU-540 can be converted to operate in serial mode. The main reason for this is so that it can be used effectively over RDP by exploiting its on-board image storage capability.
The STU-541 also supports on-board images but it cannot operate serially. Since it performs quite efficiently as a standard USB device there is probably little need to use the on-board ROM image functionality.
 

3. Serial operation:

As mentioned above the STU-540 can be converted between HID and serial mode. This facility is not available with the 541.

NOTE:

The STU-541 is no longer being manufactured owing to lack of demand.