The Craftmans Shop > New from Old
The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
russ57:
Been there... Actually yesterday, at work, looking for missing responses.
Throw in Bluetooth, packet encryption, Android and 4g network none of which take kindly to a request to explain what is going on.
Russ
mc:
Would it be worth investing in a Saleae compatible logic analyser, such as https://www.ebay.co.uk/itm/24MHz-8-Channel-USB-Logic-Analyzer-Saleae-8-CH-Logic-Analyzer-for-MCU-ARM-FPGA/112657150662 (plenty other sellers available)?
The newer genuine Saleae analysers are analogue, and a lot more expensive, but these basic digital only ones are handy for this kind of thing, and work with the Saleae software (the original Saleae interfaces were identical electronics to these cheap ones, but in a fancy case). Only limitation to storing the captured data is disc space, and the software includes various analysers/decoders - https://www.saleae.com/
awemawson:
Thanks for the link Moray, but I think it might complicate things even more than they are. I only have access to signals at the RS232 +/- 12 range so at the very least I'd need to build a simple level shifter for each CCIT circuit.
Having just now hooked up the Tektronix 834 RS232 analyser I've realised that it is actually reporting 'Framing Errors' on quite a few (but not all) characters in both directions ie from both the STEP5 PC (DCE) and the 820T (DTE).
Now this may well be a red herring, as of course we have also got the set up on the 834 analyser as well as both ends of the link which have to match. Theoretically they all do match !
. . . but I've been driven out of the workshop again by a plague of flies :bugeye: - this time far fewer than before and hopefully just the 'tail end charlies' of the last batch but I can't concentrate when they literally drop down the back of my neck into my shirt !
mc:
I never realised this was running at full 12V signal levels.
If you did rig up a basic level shifter, it would mean you could see exactly what's going on with the signal timing, which may reveal what's causing problems.
PS. A beekeeping suit would solve your immediate fly problem, and keep us entertained!
awemawson:
--- Quote from: mc on October 13, 2018, 10:48:57 AM ---I PS. A beekeeping suit would solve your immediate fly problem, and keep us entertained!
--- End quote ---
Bee .... off :clap:
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