I appreciate you forwarding this to me. However, I find most of what is
described is above my head; also it may require Windows I do not have.
I have been distracted by another issue for a while now, but that is
solved, so I intend to get back to the DMM shortly. The last effort I put
into it w
Today I chanced upon "USPPcap" - a utility designed to capture traffic on
USB ports.
http://desowin.org/usbpcap/tour.html
It seems to me, since the Windows-based software for this thing works well,
and you have a USB->serial adapter, this utility could potentially be used
to monitor the traffic o
Someone here, probably Wes, thought me embarrassing lesson:
http://lmgtfy.com/?q=python+crash+course
Put one/two day into learning basic python data types and syntax. It will
be worth it, I guarantee it.
T
On Jan 15, 2018 6:57 PM, "Denis Heidtmann"
wrote:
> Well, I have solved the issue of
Well, I have solved the issue of "mult=self.units.strip()+' '[0]:
TypeError: can't concat bytes to int". It needs parentheses, which the
original code had. Now the code runs, but, alas, now it does not report
the readings from the meter. Since I really do not understand
object-oriented python,
Last discussion on this issue I mentioned a python program I found. I
have since put the program in Spyder using Python3. I had to make a number
of changes to accommodate the change to 3. The latest is that I see that
the readings are available to the program although parsing the data is
runnin
The meter schematic I have shows two opto-isolators connected to the serial
pins. The output from the meter is an emitter follower driving the RxD pin
and the emitter resistor connected to RTS. The collector is connected to
DTR. The input to the meter drives an LED in series with a 3.3K resistor
My goal is to be able to get data from the dmm using my laptop, which has
only USB. I have an RS-232--USB adapter. Eventually I want to make the
choices more friendly.
Later today I will study the details of your observations. The protocol I
have seen described elsewhere says the host needs to
I am indeed seeing data values. The options the sw provides are not ideal,
at least as I am able to understand it, but data does come across.
I would need to understand more (i.e., something) about pyserial to make
the change to ttyUSB0, but all this is more progress than I have had in
all the t
On 01/07/18 10:04, Denis Heidtmann wrote:
>>
>> On Mon, Jan 1, 2018 at 11:46 AM, Denis Heidtmann <
>> denis.heidtm...@gmail.com>
>> wrote:
>>
>>> I am looking into ways to examine the serial traffic to/from my dmm.
>>
>
>
> I found a python script intended to interface with the mas-345:
> https:/
Do you mean you are seeing data values from the DMM? If so, does the same
software work with the USB-serial cable? You might need to modify the code
to use /dev/ttyUSB0 instead of /dev/ttyS0.
On Jan 7, 2018 10:04 AM, "Denis Heidtmann"
wrote:
>
> On Mon, Jan 1, 2018 at 11:46 AM, Denis Heidtmann <
>
> On Mon, Jan 1, 2018 at 11:46 AM, Denis Heidtmann <
> denis.heidtm...@gmail.com>
> wrote:
>
> > I am looking into ways to examine the serial traffic to/from my dmm.
>
I found a python script intended to interface with the mas-345:
https://github.com/markrages/py_test_interface
https://github.c
I'm a nomad. Let's see how this week turns out. I may have some time on
Friday.
You can always email me off list. I'll call or text you later when I have
more info about my availability.
-wes
On Mon, Jan 1, 2018 at 3:30 PM, Denis Heidtmann
wrote:
> Fantastic, Wes! My feeble abilities need lot
Fantastic, Wes! My feeble abilities need lots of help. Where are you
located? I am on the west side of Portland, not far from the zoo. I guess
posting my phone number here is not too risky. 2972837.
-Denis
On Mon, Jan 1, 2018 at 12:36 PM, wes wrote:
> On Mon, Jan 1, 2018 at 11:46 AM, Denis
On Mon, Jan 1, 2018 at 11:46 AM, Denis Heidtmann
wrote:
> I am looking into ways to examine the serial traffic to/from my dmm. The
> arrangement I think would be the most useful to examine is with the mfg.'s
> sw running in the win2k guest in the desktop. This arrangement is the only
> one that
If you decide that you need to make the measurements - there is
Bitscope logic http://bitscope.com/software/logic/ application which
should be able to display and decode the serial signal for you from the
probes.
I never needed/used it with the bitscope, but it looks legit enough
within the speed
I am looking into ways to examine the serial traffic to/from my dmm. The
arrangement I think would be the most useful to examine is with the mfg.'s
sw running in the win2k guest in the desktop. This arrangement is the only
one that successfully communicates with the dmm.
I hope (assume?) that a
I just ran the mfg. sw in the vb win2k guest. I then checked the serial
parameters in the host. I then ran sigrok-cli --driver
mastech-mas345:conn=/dev/ttyS0 --samples 10 in the host after shutting down
the guest. Same no-response result. This would seem to rule out the
possibility that the se
Tomas,
Thanks so much for the offer. I will look at the Bitscope website to see
if it would help.
-Denis
On Fri, Dec 29, 2017 at 3:36 PM, Tomas Kuchta
wrote:
> I have one of those simple Bitscope scopes/analysers for slow RPi type
> interface hacking it might be the right tool for the job an
I have one of those simple Bitscope scopes/analysers for slow RPi type
interface hacking it might be the right tool for the job and it runs on
Linux.
Would that help? Do you want to borrow it?
Check the Bitscope website for details, but it is good enough for serial
ports. Perhaps even decoding it
I made the measurements with my 'scope. The voltages and waveforms are
identical comparing DTR, RTS (also RXD), although I am surprised a little
that the pulses on DTR are as large as they are: 2.4V swing. Must be some
resistance in the supply to the drain. But the level is up at 11.6V, so
thos
I will make those measurements, but I am doubtful it will show anything.
The schematic I have shows DTR to be the collector and RTS to be the low
end of the emitter resistor of the output NPN. I did see solid pulses on
the emitter with sigrok. But perhaps DTR and/or RTS are pulsed when they
shoul
Have you measured the voltages on DTR and RTS during the runs?
Try it with sigrok and with the vendor software and see if there is a
difference in those values.
On Thu, Dec 28, 2017 at 9:51 PM, Denis Heidtmann
wrote:
> This saga continues.
>
> On the laptop with a usb-serial adapter I got to the
This saga continues.
On the laptop with a usb-serial adapter I got to the point where the
commands:
sigrok-cli --driver mastech-mas345:conn=/dev/ttyUSB0 --show
sigrok-cli --driver mastech-mas345:conn=/dev/ttyUSB0 --scan
sigrok-cli --driver mastech-mas345:conn=/dev/ttyUSB0 --samples 10
behave as e
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