24 Feb
2016
24 Feb
'16
11:20 a.m.
On 2/24/2016 10:59 AM, Eric Smith wrote:
On Tue, Feb 23, 2016 at 8:52 PM, jwsmobile <jws at
jwsss.com> wrote:
We had the analyzers out "bleeding
edge" and the originals were not
differential and were not +5 safe. They tolerated the differential 0-5
we had at one point in the circuit, and the engineer I worked with said
"hm, you are lucky" with that hookup.
I was not using the Pro, that is way late in their product line for me.
their newer 4 channel version does seem to also be differential and
RS232 voltage level compliant. (FWIW I was on RS485 differential, line
levels same as RS232, but function not).
Thanks
Jim
For serial I use a Saleae 8 bit analyzer.
[...]
You do have to use a level shifter with the thing
because it is designed for
3.3v logic and needs to be adjusted accordingly.
The Saleae Logic Pro 16 (and
probably the Logic Pro 8, but I haven't
checked) are designed for an operating input voltage range of +/-10V,
with an abs max rating of +/-25V. Saleae specifically states that it
can be directly connected to RS-232. The Logic Pro models are more expensive than the other
(amateur?)
models, but support analog input on all channels. I now use a Logic
Pro 16 for most of my simple logic analyzer requirements, but still
use an Agilent 16700 logic analyzer mainframe when I need more than 16
channels.