I have ADM485 already mounted and an output of some device, buffered by CD4050BM. For the circuit to be safe for the RS485 bus, the ADM transiver initially should either be in Z-state or read-state. "Some device" is not always connected the circuit, so I want to use pull-down resistor to archive read-state by default.
Currently I'm not able to post images here, so I'll try to give short explanation of what I'm about to do.
- -RE and DE of ADM485 are connected to each other (and this can't be changed in my case)
- These both are connected to an output CD4050BM buffer unit (input of one is conected to "some device")
- I wish to pull down this junction (-RE, DE, buffer out) with resistor of 10k.
Is it ok to do it this way? Which resistor nominal I should use?
Here is an image