Connector Pin Counting Sequence
Alternating count, or sometimes called Staggered count. This is a very typical counting pattern for dual row headers of all kinds.
Column count is simply starting at the bottom of the row on the right (female) on the left (male) and count up to the top. You then pick up the count at the bottom of the next row to the left/right and count to the top again. The pattern shown is for a 50 pos. connector but smaller D-Sub connectors will have only two columns but the pattern remains the same. This is column count.
Column count #2 is simular to the standard column count. However on this connector there is a 'A row' and a 'B row'. Both start at #1 at the bottom and count up from there.
Continuous count connectors. The LFH type connector to the left is a good example of a continuous count connector.