Texecom Premier 48 Continuous Beep When Armed - Normal?

Hi,
I have a Texecom Premier 48 panel which, when armed, makes a continuous sound through the keypads.
Is this normal behaviour for this panel or is there a setting I've missed?
The panel was set up via the usb interface / Wintex software and everything seems to be working as it should otherwise according to the software.
I've tried waiting for a few minutes outside and the sound can still be heard so I'm a little bit worried about leaving it like that...
Thanks for reading