Batboard

Hi all,
New to the group.
First post.
Dos anyone know what the 5 pin connector on the NNTN8856 Impress 2 single unit charger does?
Regards,
Nic
VK2KXN

According to the user manual it's a programming port for programming the charger. As far as I can find you need an adapter cable NNTN8870 and software.