How to connect arduino to jy-r2t?

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1

Hello,

I need to know how to connect my arduino uno to jy-r2t ( RS232 to ttl converter)

And how to send the commands?

2

it's MAX3232-based level shifter for connecting TTL-level serial to standard RS-232 serial. So you connect power Rx and Tx on one side and RS-232 on the other.

to "send" commands is just using the Serial port you are connected to (like print() or write() )