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Old March 24th, 2015   #3
StephenYim
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Join Date: Mar 2015
Posts: 11
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Dear ericthegeek,

Thanks for your time. Attachement is the picture I took from the oscilloscope.

You can see the Frequency is 20Hz, with 5V amplitude(RDM-100 is power by USB). And the Dir Pin of the RS485 Tranceiver IC(SP3075EEN:RE & DE shorted together) also has the same waveform as the RX pin, only with 3.3V amplitude(the CPU is STM32F103). I am thinking of giving up this RDM-Controller and buy another one. Do you have any good suggestion, better with a cheap price,thanks.
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File Type: jpg IMG_20150325_100022.jpg (94.8 KB, 395 views)
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