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26
Checking control network wiring with the CEM removed
You should check your control network wiring at the wallplate XLR connector
station farthest from your dimmer rack(s).
Warning! – Power must be turned OFF when you perform this procedure.
1. Remove all Control Electronics Modules (CEMs) from your dimmer racks.
Checking the DMX512 network
1. Measure resistance between the following pins on the XLR plug:
Pin 3 (Data+) and Pin 2 (Data–):
Pin 3 (Data+) and Pin 1 (Common):
Pin 3 (Data+) and ground:
Pin 2 (Data–) and Pin 1 (Common):
Pin 2 (Data–) and ground:
Checking the ETCLink network
1. Measure resistance between the following pins on the XLR plug:
Pin 1 (Data+) and Pin 2 (Data–):
Note: The connection between Pin 1 and Pin 2 is created by the ETCLink
termination cube. If your ETCLink network does not have a termination
cube installed, resistance will be above 10M Ω . See Installing network
connection terminals on page 37.
Pin 1 (Data+) and Pin 7 (Common):
Pin 1 (Data+) and ground:
Pin 2 (Data–) and Pin 7 (Common):
Pin 2 (Data–) and ground:
Pin 7 (Common) and ground:
Pins 5 and 6 (aux power):
Pin 5 (Aux power) and ground:
Pin 6 (Aux power) and ground:
Checking DMX512 network wiring with the CEM installed
You should check your DMX512 network wiring at the wallplate XLR
connector station farthest from your dimmer rack(s).
1. Install all CEMs into your dimmer racks
2. Measure resistance between Pin 3 (Data+) and Pin 2 (Data–). It should be
between 90 – 130Ω. The following readings indicate a problem:
Below 50Ω – network is double terminated
Above 1MΩ – network is not terminated
Below 1Ω – data wires are shorted together
Above 10MΩ
Above 10MΩ
Above 10MΩ
Above 10MΩ
Above 10MΩ
Between 475 – 525Ω
Above 10MΩ
Above 10MΩ
Above 10MΩ
Above 10MΩ
Above 10MΩ
Above 10MΩ
Above 10MΩ
Above 10MΩ
Electronic Theatre Controls, Inc.
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