Hey Alan,
what @onefinitycnc says about Spindle port pin 2 means that it is in use by the system and has nothing to do with the connection to the VFD. The opto outputs and the TTL outputs can be used at the same time without intefering.
The TTL outputs pin 2 and 3 are not needed for the connection to a VFD, so I don’t see the reason to include them in my table. In this image that shows the direct connection of Masso to Hitachi VFD, I simply did not show them:
