It looks like it's on the opposite side from the terminals ... here's a picture from the web page.
They are bi-directional, so the connections shouldn't matter .... but I attached a common a separate port diagram from the web page.
The other thing to be aware of ... if you are switching inverter power ... is that the pre-charge circuit only works when the DCC is manually powered up ... it doesn't work if the BMS turns it off and back on. I hope they fix that one of these days.
If you search on Youtube there is a nice video where the guy used a Chargery delay board to automate a pre-charge circuit.
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