what is an inverted cam

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Question
Answer
 A 1 1/4" cylinder with straight cam is required for the Von Duprin SD (Special Dogging) exit device option.
The cylinder cam must be inverted with the SD option to work properly.
Von Duprin KR (key removable) mullions requires a 1-1/8" or 1-1/4" mortise cylinder with the standard straight cam, the cam is not inverted. Please see chart below for part numbers. 
instructions
The cam is not inverted on the mortise cylinder for the CD option.
The Von Duprin CD kit comes with the cover plate machined to accept the cylinder dogging mortise cylinder.1 1/4" mortise cylinder with an inverted straight cam is required for CD option on Von Dupr...
Effective July, 2014, there is no longer a specific modular cam part number for dogging. The Schlage modular straight cams come with two mouting holes that allow for the cams to be mounted inverted...
The 30-001 is a conventional mortise cylinder with a clover cam, compression ring and spring for use on rose trim. For use with the L9000 mortise locks except for the L9060 outside cylinder.
The 20-001 is a conventional mortise cylinder with a straight cam, compression ring and spring for use on rose trim. For use with the L9060 outside cylinder or other straight cam applications.
To convert a Schlage ND80 to a ND70 you can replace the keycam or chassis and use your existing trim. Ordering Instructions: Keycam only: N123-010 Chassis and springcages: ND70LD LLL 626 LL...
Devices built After 2/28/2011: Use a 1 1/8" - 1 1/4" mortise cylinder with straight narrow cam. (Cam profile same as the Schlage B520-731, see table below for part numbers) Devices built Befo...
 Modular 1-1/8"  Modular 1-1/4"  SFIC and FSIC  Non-Modular Non-IC Conventional  Non-Modular Non-IC Everest Primus  B520-730  B520-731  B520-2...