NX-10 Expander Installation Guide
111
Wiring the NX-534E listen-in module
Table 12. NX-534E terminal connections
Terminal Description
Connector on the left side.
1 Connect positive side of microphone #A.
2 Connect negative side of microphone #A.
3 Connect positive side of microphone #B.
4 Connect negative side of microphone #B.
SPK+ SPK- Connect to the speaker(s). Maximum speaker wire run: 300m. Minimum speaker rating: 5
Watts, 8 Ohms. Do not go below 4 Ohms.
General operating instructions
The system operates as follows, regardless of how a two-way session is started.
• The session timer is started. Select NX-534E>Timers>Session Timeout.
• All microphones are on. Select Installer Menu>NX-534E>Feature Select>Mic A at
Startup or Installer Menu>NX-534E>Feature Select>Mic B at Startup.
• Low gain listen-in audio mode is selected (automatic).
• Level 0 command set is active (automatic).
• The NX-534E listen-in module operates in one of two modes that must be
programmed in. Select NX-534E>Feature Select>Mode.
Line hold mode
1. An alarm is recognized.
2. The phone line is seized from the control panel and all phones on the premises.
3. The line disconnects (goes off the hook).
4. The NX-534E listen-in module sends a tone indicator to the central station. For more
details see Tones.
5. If a line hold digit has been programmed, the system will wait for the digit to be received
before a two-way session is started. To check this, select NX-534E>Line Hold digit. If the
digit is not received before the time-out period, the system returns to stand-by mode and
waits for a new trip.
6. If the line hold digit is received or not programmed, the system starts a two-way session.
Call back mode
1. An alarm is recognized.
2. The phone line is seized from the control panel and all phones on the premises.
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