Chapter 2 Using Your Cyberlight
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2
You should test each cable with a voltage/ohm meter (VOM) to verify correct polarity and to make
sure that the negative and positive pins are not grounded or shorted to the shield or to each other.
Also, make sure that pin 1 is shielded.
Caution
Do not use the ground lug on the XLR connectors. Do not connect the
shield to ground or allow contact to ground. Grounding the shield could
cause a ground loop and/or erratic behavior.
Terminators
The last device on each link must have a 120 ohm, 1/4 watt (minimum) terminator attached to its
Data Out connector. (This is true for both DMX 512 protocol or LWR protocol.) Two terminators
are shipped with each link card (supplied with the Status Cue system).
You can construct terminators by following the instructions below:
Figure 2-3. Constructing a data cable terminator.
Table 2-3: XLR Cable Pinouts
Pin 1 is the shield
Pin 2 is the data compliment (negative)
Pin 3 is the data true (positive)
1. Obtain a male XLR connector.
2. Disassemble the connector.
3. Solder a 120 ohm resistor,
minimum of 1/4 watt, between pins 2 and 3.
4. Reassemble the XLR connector.
5. Install the terminator in the Data Out port of
1
2
3
the last device in the link.
Содержание Cyberlight
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