Hi,
In the test of ISO3082, we obverse both output A&B are driven to "low" at the 1st bit after enable driver.
If the device work properly, when D = '0'
A='0', B='1'
But, from capture, when D = '0', after enable driver with D='1'
A='0', B='0' then turn to '1' after 0.8us.
Is this the correct behavior for ISO3082?
Schematic: There is a modification on board R36 = R42 = 680 Ohm.
Waveform: CH1: RS485_TX(D); CH2: RS485-(B); CH3: RS485+(A); CH4: S485_EN(DE)
Thanks.
Zhou