Installation manual

IVX C-Class Installation Manual Function 3: Extension programming
F.3
Overhead paging interface
You can connect a dry-contact overhead paging device to the system through the first port card’s 66
block. The overhead paging port’s access is fixed as extension 199 for programming purposes. The
user can access it by:
(a.) Dialing 1 9 9
or
(b.) Programming 199 as a programmable key and/or including 199 in the page zone.
Note: DTMF can be transmitted to the overhead paging port after access, allowing for zone overhead paging,
if the paging unit supports zone paging.
1. 2.
Ext. Type Name CO Page Zone
199 0
Dry contact control
The manner in which the dry contact pair is punched down on the 66 block sets the pair as either
normally open (sending a page to the port will close the contacts) or normally closed (sending a page
to the port will open the contacts). See the “Hardware installation” section (beginning on page B.5).