9/10/2023 0 Comments Molex pinout downloadPCB footprints are almost always shown looking top down at the part as it would be mounted. Compare to "common knowledge" or standards online. Mark which pins are drivers and which are receivers. Look at the drawing for each connector, make sure it's clear that the connections are shown looking from the top or bottom or looking into the connector or behind the connector, etc. I always sit down and draw this stuff out when reviewing a design. Ribbon cables can be assembled in four different ways for each connector. RS-232 serial ports can be a real nightmare. Even if the same plug is used on the both ends of a cable, if it is not wired symmetrically, then you need to make sure you don't reverse the connection ends. Once you go to a cable or wire harness all bets are off. Generally, there is a mating pair of connectors and their pin numbers are going to match, so that pin 1 on a PCB mounted jack is going make an electrical connection to pin 1 on a cable mounted plug. Connectors are a common source of error in a design.
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