For this experiment we are using asynchronous half-duplex RS-485 between Manage and Execute. It requires a single twisted-pair. We use the connectors A1 & B1. By convention, A will have an orange wire while B will have a blue wire.
When the board is flat on a table, the twisted pair is in the top row of the connector.
When the board is flat on a table, the twisted pair is in the bottom row of the connector.