I have purchased TH-03. But my laptop does not have serial port, so I purchased USB Data Acquisition from you. I have also install all drivers for both TH-03 and USB data acquisition. I can also find 'serial on usb port (com4)' in device manager. But when I connect such USB data acquisition to TH-03, and then connect to USB port on my laptop, the information 'TH-03 unit not found' turns up when I launch picolog to set up input channel. In order to find out whether such problem is nothing to do with TH-03 device, I connect it to my desktop which has built-in serial port. Then TH-03 can be found by picolog and works fine. So, I guess my problem would be caused by this USB Data Acquisition. Does anybody have any suggestions as to what can be done to resolve this issue? Many thanks.