Adding Loud Bell Control Or Gate Control; Loud Ringing Bell Installation Procedure - Comdial DX-80 Technical Manual

2.15 Adding Loud Bell Control or Gate Control

One "dry-connection" is provided at the CPM of the DX-80 system for use with external ringing
devices or door opening apparatus. The DX-80 can be programmed to activate the dry contact
whenever certain CO lines ring or whenever the LBC code is dialed to actuate a door opener.

2.15.1 LOUD RINGING BELL INSTALLATION PROCEDURE

1. Remove the KSU cover (four screws at each corner) of KSU1.
2. Connect a static discharge wrist strap to a suitable earth ground. Be sure that the strap is touch-
ing bare skin.
Circuit boards are susceptible to damage caused by electrostatic
discharge. You must keep this in mind as you handle the circuit
boards. Refer to Comdial publication IMI01-005, Handling of Electrostatically
3. Locate the CPM and "BELL" connector jack on the CPM.
4. Using an eighth-inch mini plug, wire the DX-80 BELL contact in series with an external 24vdc
power supply and 24vdc bell or ringing device. Important: Use only 24v or less voltage sup-
ply and Direct Current (dc).
5. Program LBC operation for CO line ringing according to CO line group assignments. See the
DX-80 Technical Manual, Volume II, Programming for details on programming.
October, '03
CPM
"BELL" control connector
(wires to bell and power
WARNING
Sensitive Components , for details.
Comdial
DX-80 Installation & Maintenance
supply)
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