@borjam
Got your PM.
What concerns me is even while you're DC coupled the idle level is undetermined, it's midway neither Hi or Lo.
How can that be ?It's a two wire RS485 bus, which means it's half duplex. Devices are in high impedance mode when receving. In order to transmit, a device changes the port mode to transmission (which makes it reach the set the right idle mode), it transmits and after transmission it goes back to high impedance. That's why you see a 0 volt idle level.
Some devices can be a bit different. This one for example is a ModbusTCP-RS485 gateway and it doesn't assert the serial line before transmitting but it just begins with the first start bit. In another example I tried, using a different RS485 device, the line is "activated" in idle mode (so, the voltage goes high) and it waits for several ms before sending the first stop bit.
I am attaching a sample of that other device, this time captured on a Rigol DS1000Z. I tried this same device with the Siglent and it failed to decode the first byte successfully depending on the time base I configured.
In this case you see the idle value is around 2 V (positive).
I have been trying with a RS485 bus, capturing Modbus packets at 9600 bps. And packets for which all the bytes decoded successfully at 10 ms/div had some errors when capturing at 50 or 100 ms/div.
Is this from the 8th still true:QuoteI have been trying with a RS485 bus, capturing Modbus packets at 9600 bps. And packets for which all the bytes decoded successfully at 10 ms/div had some errors when capturing at 50 or 100 ms/div.And it's a timebase specific thing ?
Which implies it's doing it wrong in the old ROLL mode settings, something that was supposed to be fixed in the X (not X-E) series but this is a little different.
Factory is finished for today but I'll have some time to have a bash with my test board and see if I can duplicate it in the morning and report it before they get to work.
Is this from the 8th still true:QuoteI have been trying with a RS485 bus, capturing Modbus packets at 9600 bps. And packets for which all the bytes decoded successfully at 10 ms/div had some errors when capturing at 50 or 100 ms/div.And it's a timebase specific thing ?
Which implies it's doing it wrong in the old ROLL mode settings, something that was supposed to be fixed in the X (not X-E) series but this is a little different.
Factory is finished for today but I'll have some time to have a bash with my test board and see if I can duplicate it in the morning and report it before they get to work.I disabled the roll mode of course.
Anyway, I have a full capture (14 MB file) and setup.xml file. You can send them to Siglent so that they can determine wether it's a bug or not.
As a matter of fact I purchased my scope from Batronix, maybe I should let them know as well. But given that you are already following the issue here it might be redundant. No matter where you distribute them I guess you are interested on Siglent products working properly.
Maybe even Siglent is reading. Hello?
How does the GDS-1054B compare to these two models?
How does the GDS-1054B compare to these two models?
Hi all,
was wondering if there has been any major changes in this comparison in the last couple of months. I'm deciding between these two and the micsig TO1104 which is now on sale for ~$80 off. Thought it might be better to use this thread than starting an entirely new one. Any advice would be greatly appreciated. Main use case is school projects and hobby stuff using the MSP430 and the atmega2560.
deciding between these two and the micsig TO1104
was wondering if there has been any major changes in this comparison in the last couple of months. I'm deciding between these two and the micsig TO1104 which is now on sale for ~$80 off. Thought it might be better to use this thread than starting an entirely new one. Any advice would be greatly appreciated. Main use case is school projects and hobby stuff using the MSP430 and the atmega2560.
was wondering if there has been any major changes in this comparison in the last couple of months. I'm deciding between these two and the micsig TO1104 which is now on sale for ~$80 off. Thought it might be better to use this thread than starting an entirely new one. Any advice would be greatly appreciated. Main use case is school projects and hobby stuff using the MSP430 and the atmega2560.Micsig allows for a different work style. You test something, then take scope to the sofa to review waveforms and videos
Micsig allows for a different work style. You test something, then take scope to the sofa to review waveforms and videos
I am curious about the relative performance with FFTs. Perusal of these blogs leads me to believe the Siglent 1202xe is the better performer in this area. Since they both use 8 bit A/
Like many others I'm trying to decide between the 1054z and Siglent's 1202xe. I'm not willing to pay the extra bucks for the new 1204xe with first generation firmware. My interests mostly involve audio and power supplies with occasional dabbling in arduino, esp8266 etc. I am curious about the relative performance with FFTs. Perusal of these blogs leads me to believe the Siglent 1202xe is the better performer in this area. Since they both use 8 bit A/D, is the difference due to Siglent's newer more powerful SOC? Is the Rigol limited by its processing hardware or is it possible that a firmware change could close the gap? What is the nature of the FFT difference today and is it likely to change? 4 channels is not a trump card for me nor is a 200Mhz bw. I also acknowledge Siglent's compensation vs attention problem but don't think it'll be a show stopper for me. Thanks for any advice.
And let's not forget about Digilent's 'Analog Discovery' which sits somewhere between a sound card and an oscilloscope.
And let's not forget about Digilent's 'Analog Discovery' which sits somewhere between a sound card and an oscilloscope.