1. Have you used Telnet or Windows Hyperterminal to test this?
2. Where is the prontoscript that you are attempting to use to do this?

You did not paste the link to the protocol spec so everything here you state is hypothetical.

How are your sending the 0x0d? Are you escaping this within your string using '\r'? I would love to help but you have given me nothing other than asking how to build a command for your equipment.