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If your teletype's keyboard and printer are both wired up to the same current loop so that whatever you type on the keyboard is also instantly printed on the same machine's printer, then you will want to wire up your board in half duplex, single loop mode (this is most common). To do this, simply put a small bit of hookup wire between the innermost TX and RX terminals, as depicted below (TO ADD IMAGE). If you purchased a board through me, then the hookup wire should already be in place. Then wire the remaining two outermost terminals in series to the loop-- think of one as input and one as output. Polarity doesn't matter. When finished, your loop should look something like this (TO ADD DIAGRAM BELOW).

If your teletype's keyboard and printer are wired up to separate current loops so that anything you type on the keyboard is NOT printed on the same machine's printer but is rather meant to only be printed at a remote machine's printer, then you will want to wire up the RX and TX terminals to the two separate current loops. Polarity doesn't matter on either loop. This is full duplex mode. This is a less common setup but is not entirely uncommon. When finished, your two loops should look something like this (TO ADD DIAGRAM AND IMAGE).

Once this is done, plug the board into the computer and turn on the current loop power supply and any machines on the loop you wish to test with.

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