Andover Controls CMX 240 Series, Руководство по установке

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CMX 240 Series Installation Guide 5
Cables that form Infinet are 24-gauge, single-twisted-pair, tinned,
shielded copper wire. Use the following cables1 or their equivalents:
Note
You must use shielded cables for Infinet to ensure compliance with the
Class A FCC limits and to communicate reliably.
• Brand Rex # H 9002 (single-pair)
• Anixter # 9J2401021 (single-pair plenum cable)
The cable should have a nominal impedance of 100
Ω
and a nominal
velocity of propagation of 78%.
The capacitance of the Infinet cable should be smaller than or equal to
12.5 pF/ft between conductors and smaller than or equal to 22 pF/ft
between the conductor connected to ground and the next conductor.
Number of Infinet Controllers on CMX Infinet
You can have up to 64 Infinet controllers on a single CMX Infinet.
Table 1 shows the various model numbers and the number of Infinet
controllers you can have on each.
The differences between the CMX 240/241 and the CMX 245/246 are
differences in what you can program them to do. The CMX 245 and 246
allow you to choose Command mode on a terminal connected to
COMM2. For details, see the Infinity Controller Programmer’s Guide.
1. You can also use any cables you may already have in place for ACNET or LBUS.
Table 1. Number of Infinet Controllers
Allowed on Various CMX 240s
No.
Ctlrs CMX Model
Standard CMX Model with
Command Mode
32 CMX 240 CMX 245
64 CMX 241 CMX 246
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