I have exactly the same problem.

• I have bought two of those sensors a few month ago, NAV-VIEW had no problems with communication or changing settings.
• I have bought another two, a few days ago. Can not communicate with any one of them through RS232. NAV-VIEW just can not see them. There is no activity on sensor's transmit line at all.

I would appreciate help from ACEINNA. You have great sensors, once the users can make them work...

P/N 8360-3305--054, serial numbers - 2103000888 , 210300874. Is the firmware in them "updated"?