The 10-position dip-switch located just underneath the H.100 bus (labeled BS1) is used to terminate the H.100 bus. All 10 positions should be turned ON (upward position) if this board is located at the end of the H.100 bus. If this board is one of the middle board on the H.100 bus then all positions should be turned OFF (downward position).

The 4 position dip-switch is normally turned ON. It should only be turned turned to the OFF position if the optional Hermod-20dB amplifier (HMA-1044-1) board is populated on the BJ3 and BJ4 2x20-pin stack connectors.