Last week there were issues noted with the Picomotor cable for EX TMS, and it was traced to mislabeling of the (4) Mighty Mouse connectors on a D1000238 cable (basically you want the Mighty Mouse closest to pin-1 of the 25-pin connector to be labeled "D" (@ EX it was labeled "A"). 

I went ahead and confirmed that our (6) remaining D1000238's were labeled correctly (they are), and then also marked the shell of the DB25 with a "1" on its outer surface close to where pin #1 is (see attached photo).  This is because it's impossible to confirm the orientation of the DB25 (or where pin#1) is when it's connected to another cable and screwed down to a cable bracket.  So, if one marks the outside of the connector it's easy to determine the orientation of the connector without unplugging everything.