So you see the "Z00" part but don't see the "Z00" part?!? I think you are confused. The hex characters 00, 01, 02 , and 04 are not printable so it is natural that you would not see them. Putty may have a mode where it shows 'control characters' in some form.
If the sign is not reacting as you expect, perhaps the baud rate is wrong or there are other steps required before it will accept commands.