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I can not find 6N138N.
I can find only 6N138 or 6N138-I or 6N138-000E.
What can I do?
Thanks.

You can use any 6n138 or 6n137 which you can find.
You can also omit it if you're going to use USB only.

dmitri wrote:You can use any 6n138 or 6n137 which you can find.
You can also omit it if you're going to use USB only.

Thank youDmitri.
Cristian