in vCenter 6.5 web client, I don't see a way to add a serial port to a new or existing VM. When I edit VM settings, the only options under Add New Hardware are hard drives, CD/DVD, Network adapters or SCSI controllers.
Is this a limitation of my edition of vCenter? I'm using essentials right now. vCenter clearly knows about the serial port (if I add it using the vSphere client directly against the host) and it can even prompt me to answer the question of whether the serial port's log should go to a file via append/replace. But I can't add a new port, change where the file is going, etc.