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Hi Rezer,
I was thinking along these lines but needed a little backup / confidence I have found an alternative does this look OK to you?
https://www.electro-tech-online.com/custompdfs/2008/09/MC74VHC1GT126-DPDF-1.pdf
I am currently making a PCB without the buffer, once it's made I will patch board with this new buffer and try it, I will give feedback as soon as I know.
P.S. Baud is only 9600
That's what I was thinking.
Usually they have a programmable loop back mode for testing. Is that turned off?
Are you talking about the buffer IC? If so, there isn't any loop-back mode on this device. Please explain.
Well maybe I'm not sure what you are talking about but the NS16450 and it's predecessors have a programmable loop back feature which will send back the data it receives. They are a full duplex chip and you have to turn that feature off.