Honored Contributor
Honored Contributoris your intension to use the epm pins aup and bdown to enable or disable slightly forced rs485 levels into idle levels ? to enshure proper 0 and 1's when not using the rs485 bus ?
your schematic (altium designer?) mentions 5V does this mean your rs485 bus runs at 5v levels between a and b line ? in addition i fully agree with FvM that you should realy take care about the rs485 levels as the epm240would withstand the emc like a bulletproof 15KV MAX485EESA tranceiver. between your adlevel 1 -> 0 -> 1 transitions, there seems to be reflection on a and b due to unterminated signals if i interprete these staircases correctly. but what does the blue line mean ? is it the input signal from your tranceiver ?
