Chapter 5: Installation
EST3X Technical Reference Manual 129
Test
circuits 1. Verify the continuity of each conductor. Each conductor
should measure less than 50 Ω.
2. Measure the resistance between conductors. The circuit
resistance between conductors should be infinite if no
devices are connected to the circuit.
3. Measure the resistance between each conductor and earth
ground. The circuit resistance between a conductors and
earth ground should be infinite.
Traditional initiating device
circuits
1. Verify the continuity of each conductor.
2. Measure the resistance between conductors. The circuit
resistance between conductors should be infinite if no
devices are connected to the circuit. The circuit resistance
between conductors should be approximately 4.7 kΩ when
devices are installed.
3. Measure the resistance between each conductor and earth
ground. The circuit resistance between a conductors and
earth ground should be infinite.
-485 communication
The EST3X control panel uses RS-485 circuits for the:
• Network data riser
• Network audio riser
1. Verify the continuity of each conductor. Each conductor
should measure between 0 and 50 Ω.
2. Measure the resistance between conductors. The circuit
resistance between conductors should be infinite if no
devices are connected to the circuit. The circuit resistance
between conductors should be approximately 50 Ω when
devices are installed.
3. Measure the resistance between each conductor and earth
ground. The circuit resistance between a conductors and
earth ground should be infinite.
-232 Communication
With both ends of the circuit disconnected:
1. Verify the continuity of each conductor. Each conductor
should measure between 0 and 25 Ω.
2. Measure the resistance between conductors. The circuit
resistance between conductors should be infinite.
3. Measure the resistance between each conductor and earth
ground. The circuit resistance between a conductors and
earth ground should be infinite.
Measure the resistance between the earth ground terminal and a
convenient water pipe or electrical conduit. The circuit resistance
should be less than 0.1 Ω.
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