USB-UIRT Multizone Support

[sixdoubleo]

How do I tell if my USB-UIRT supports the 3 discreet zone output?

I have 3 USB-UIRT units that I have purchased over the last 1-2 years. I understand that the ones sold after Feb 2004 have multi-zone support. Unfortunately I'm not sure if I purchased any after that time.

How can I tell whether a particular unit supports this?

[sixdoubleo]

Nevermind. I found the answer in the USBUIRT forum.

USB-UIRT's manufactured since Mid-February 2004 have added multi-zone support in the hardware. This allows these units to effectively have three (3) Zones:

Q: How do I know if my unit supports Zones?
A: The serial number on the back of your unit will have a small letter 'Z' after it if it supports multi-zone commands.

Looks like at least one of my units has multi-zone capability.