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Crestron QM-AMP3x80 Series QuickMedia™ 3-Channel Amplifiers
the run should be used in the following resistance equation to calculate the value on
the right side of the equation.
Resistance Equation
R = Resistance (refer to table below).
L = Length of run (or chain) in feet.
PF = Power factor of entire run (or chain).
R <
L x PF
40,000
Where:
The required wire gauge should be chosen such that the resistance value is less than
the value calculated in the resistance equation. Refer to the table after this paragraph.
Wire Gauge Values
RESISTANCE (R) WIRE GAUGE
4
16
6
18
10
20
15
22
13
Doubled CAT5
8.7
Tripled CAT5
NOTE: All network wiring must consist of two twisted pairs. One twisted pair is
the +24V conductor and the GND conductor. The other twisted pair is the Y and Z
conductors.
NOTE: When daisy-chaining Cresnet units, strip the ends of the wires carefully to
avoid nicking the conductors. Twist together the ends of the wires that share a pin on
the network connector, and tin the twisted connection. Apply solder only to the ends
of the twisted wires. Avoid tinning too far up the wires or the end becomes brittle.
Insert the tinned connection into the Cresnet connector and tighten the retaining
screw. Repeat the procedure for the other three conductors.
NOTE: For larger networks (i.e., greater than 28 network devices), it may become
necessary to add a Cresnet Hub/Repeater (CNXHUB) or Cresnet Network Poll
Accelerator (C2N-NPA8) to maintain signal quality throughout the network. Also,
for networks with lengthy cable runs, it may be necessary to add a Hub/Repeater
after only 20 devices.
Identity Code
All equipment and user interfaces within the network require a unique identity code
(Net ID). These codes are two-digit hexadecimal numbers from 03 to FE. The Net ID
of each unit must match an ID code specified in the SIMPL Windows program.
Refer to “Setting the Net ID in Device Settings” on page 18 for details of the SIMPL
Windows procedure.
Refer to the note on page 20 for a
definition of Viewport.
The Net ID of the AMP3x80 has been factory set to 09. The Net IDs of multiple
AMP3x80s in the same system must be unique. Net IDs are changed from a
personal computer (PC) via the Crestron Viewport.
NOTE: For detailed information on establishing communication between the PC and
control system, refer to “Communication Settings” on page 20. If communication
cannot be established, refer to the “Troubleshooting Communications” section in the
respective Operations Guide for the control system.
Operations Guide – DOC. 6272 QuickMedia™ 3-Channel Amplifiers: QM-AMP3x80 Series • 9