Specifications

Crestron TPMC-CH-IMC Interface Module
NOTE: Do not power up system until all wiring is verified. Care should
be taken to ensure data (Y, Z) and ground (G) connections are not
crossed when connecting the TPMC-CH-IMC.
When calculating the wire gauge for a particular Cresnet run, the length
of the run and the Cresnet power usage of each Cresnet unit to be
connected must be taken into consideration. If Cresnet units are to be
daisy-chained on the run, the Cresnet power usage of each network unit
to be daisy-chained must be added together to determine the Cresnet
power usage of the entire chain. If the unit is a home-run from a Crestron
system power supply network port, the Cresnet power usage of that unit
is the Cresnet power usage of the entire run. The length of the run in feet
and the Cresnet power usage of 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 the following table).
L = Length of run (or chain) in feet.
P = Cresnet power usage of entire run (or chain).
R <
L x P
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
Operations Guide - DOC. 6345 Interface Module: TPMC-CH-IMC • 9