Navtel 9460 Protocol Analyzer info?

I have a couple of simple serial datascope packages in my Labtools ... I don't supply cables, I just give details on how to make them. Basically, there are two sets of signals to monitor, one going from DTE -> DCE, and one going from DCE -> DTE ... What the "Y" cable does is simply connect the DTE generated signals to the input signals on one COM port, and the DCE generated signals to the input signals on the another COM port. The software reads the two com ports and displays the two signals paths in a standard dual/split line format, with DTE signals on one line, and DCE signals on the other. (Since PCs are DTE's, the input signals to the COM ports are the DCE lines at the PCs serial connector). The DTE signals (outputs) from the PC COM ports are not connected, so the PC does not drive either side ... it just passivly monitors the traffic on the line. For short runs at the speeds commonly handled by a PC serial port, the extra loading of the passive receiver is usually not a problem. One limitation of this approach is that the PC cannot interact with the devices. Some stand-alone/higher-end scopes feature simulation, injection and other features which require that they be able to transmit on the line in specific circumstances these usually have their own set of line drivers and receivers, and act as a simple repeater during passive monitoring. Regards, Dave -- dave04a (at) Dave Dunfield dunfield (dot) Firmware development services & tools: www.dunfield.com com Collector of vintage computing equipment: http://www.parse.com/~ddunfield/museum/index.html