You can get the manual at AB:
http://literature.rockwellautomation.com/idc/groups/literature/documents/um/2711-um014_-en-p.pdf
What model PV600 do you have? When you open PB32 you have to select the correct model. 2711-K6C16 PV600 Color Key, FRN 4.10-4.xx, this is a DF1 model.
IF its not a DF1 model then you will probably need an adapter to connect but since you say you have physically connected I will "assume" it is a DF1 model.
Forget about RSLinx at this time, close it or at least stop it from running if it is a PIC driver, the PIC hogs the com port. With DF1 PB32 has a utility for uploading etc.
You will need cable 2711-NC13, I will show a picture of it at the end.
Open PB32, select correct model, give it an application name, click OK. PB32 will now be ready to work with, goto FILE in the top left corner of PB32 and click on it, scroll down to Upload and click on that. A window will open allowing you to setup where the file goes, what name it has and communication setup....HERE is the DEAL, you must set this for Com1 or Com2 to match the com port on your PC, the baud rate etc MUST match too or it can be a problem.
If your PC serial port is built in then it will be either com1 or com2 and can be seen in windows control panel>system>Device Manager>Ports, see if it shows as Com1 or Com2, while there verify the baud rate etc and match it and the PB32 setup.
Once you know all the settings match, have the correct model, correct cable then click OK for the Upload.
Another window should open showing transfer status.
Here is the cable pinout: