Products > Test Equipment
Gw Instek GDS2204E (200MHz 4 channel DSO) review
CC555:
Hello,
I bought this oscilloscope (GDS-2204e 1050€ on tme.eu) to try to solve some rs232 issues, I like it but I don't know if rs232 decoder is working properly (firmware version 1.32).
I connect the GDS-2204e and a DS1054Z to the same signals and I get different decoder results.
I am triggering the oscilloscopes at yellow signal's rising edge and capturing an uart communication (57600 8N1).
When I look at the same communication packets on the oscilloscopes I see different decoder results:
Rigol
GW
If I look at the first byte, I think rigol is decoding the signal right, at 57600 this is 02 (if I am not wrong :) ):
Am I doing anything wrong with the GD-2204e or is it a bug?
If the GW doesn't decode the RS232 properly I will return it. Any good and cheap.. oscilloscope recommendation to work with serial buses (I2C, SPI, RS232 and full memory decoding)?.
Thank you and excuse my english.
tautech:
You need to set a falling edge trigger on the GW.
CC555:
Hello tautech,
thanks for your reply, setting a falling edge (channel 1) on both oscillocopes I get the same result.
2N3055:
Try setting polarity normal (high = 0)..
wraper:
As I remember someone wrote that he got wrong decoding on instek and fine on Rigol or maybe some other scope. Turned out that actual baud rate was off but Rigol was more tolerant to that. And after firmware update instek became more tolerant to inaccurate baud rate.
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