Double buffer on a parallel to serial converter how to#
So, how to run the full display info over one or two wires? Update rate is 1 reading per second, or 1 reading every 4 seconds, not a lot of data – still it needs to be reliable, easy to use.Īfter some consideration, I decided to use a RS232 interface, with TTL level logic (rather than RS232 voltage levels-only using a short cable), and running it at 2400 bps, transmitting the data from the 1295 receiver to the main micro. 500 Volts, 7.5 Amp – seems like a lot for such a small connector, at 14.99 USD each (plug only). Still, available today… but the first piece of test equipment that I have ever seen that uses such kind of connectors. The modification should be reversible.īut there is a solution – the band selection connector, which is already used to remotely control the band switching, has a few spare pins!ĪMPHENOL/Wire-Pro “WPI” 9-pin “126 series” miniature hexagonal connector, 126-220 these connectors have been introduced in the 1940s, or latest, in the 50s. In brief, after trying hard, I gave up – there need to be a more practical way to read the 1295 data.įirst, how to get the data out, if not through the IEEE-488 interface? The case if fully closed, and drilling a hole, mounting a connector – NO.
The only thing I need are the attenuation readings, in dB, same as shown on the front LED display.Īlso, these GPIB cards are expensive, and I would rather like to control the whole attenuator calibration rig through one single USB port – also to be able to run in with various computers, not just with a dedicated machine. In principle, but, not with ease and, as it turns out, the build-in processor is running on 70s hardware, and doesn’t respond well to my National Instrument GPIB card.
The Micro-Tel 1295 has a GPIB (IEEE-488) interface, and in principle, can be fully controlled through this.