ADM3066E crossing A-B for inverted logic

avihai on Sep 16, 2020

Hello,

I have 2 circuits which have the ADM3066E for Single-ended to RS485 translation.

I'd like to invert the logic so when circuit 1 transmits "high", circuit 2 will read "low", without changing the circuits.

Will it work well if I only connect the A pin of circuit to pin B on circuit 2 (and B to A in the same way)?

Thanks

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NQuinn
Sep 16, 2020 +1 verified
Hello,

Your solution will work well,

It's worth noting that when the circuit 1 is not transmitting, the A/B bus will be idle ( differential voltage Va-Vb = 0V ) and receiver circuit 2 will receive a logic…

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+1 NQuinn

on Sep 16, 2020 4:54 PM 9 months ago

Hello,

Your solution will work well,

It's worth noting that when the circuit 1 is not transmitting, the A/B bus will be idle ( differential voltage Va-Vb = 0V ) and receiver circuit 2 will receive a logic 1. The receiver failsafe circuitry within the ADM3066E means the receiver outputs a logic 1 when Va-Vb = 0V

Circuit 1	Bus State	Circuit #2 (reversed)
Transmitting High (DI = DE = 1)	Bus High (VA - VB > 200mV)	Receiving Low (RO = 0)
Transmitting Low (DI = 0, DE = 1)	Bus Low (VA - VB < -200mV)	Receiving High (RO = 1)
Driver Disabled (DE = 0)	Bus idle (VA - VB = 0V)	Failsafe High (RO = 1)

Regards,

Neil

0 avihai on Sep 17, 2020 4:44 AM 9 months ago in reply to NQuinn

Thank you Neil.
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0 avihai on Sep 17, 2020 4:44 AM 9 months ago in reply to NQuinn

Thank you Neil.
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