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Subnetwork Installation Guidelines
Network Guide 75
Subnetwork Data Bus Length
The length of the subnetwork data bus varies according to the type of controller and the types
of connected subnetwork modules as follows:
For all controllers that do not support the 2-Wire subnetwork data bus , the maximum length of
the Cat 5e cable subnetwork data bus is 600 ft (180 m). See
Figure 44 .
For ECB-600 or ECL-600 Series controllers:
• When no ECx-4XX I/O Extension Module is connected to the controller, the maximum
length of the Cat 5e subnetwork data bus is 600 ft (180 m). See
Figure 44 .
• When no Cat 5e subnetwork extension module is connected to the controller, the maxi-
mum length of the 2-Wire subnetwork data bus is 1 000 ft (300 m). See
Figure 46 .
• When both ECx-4XX I/O Extension Modules (using the 2-wire subnetwork data bus) and
subnetwork extension modules (using the Cat 5e cable subnetwork data bus) are con-
nected, the total maximum length of all subnetwork data buses is 1 000 ft (300 m), of
which the length of the Cat 5e subnetwork data bus can be no more than 600 ft (180 m).
See
Figure 47 .
See below:
Figure 44: Maximum Length of the Cat 5e Cable Subnetwork Data Bus, ECB/ ECL
2
Series Controllers
2. This includes the following models: ECB/ECL-VAV Series, ECB/ECL-103, ECB/ECL-203
Series, ECB/ECL-300 Series, ECB/ECL-400 Series, ECB/ECL-PTU-107, ECB/ECL-PTU-
207, ECB/ECL-PTU-208, ECB/ECL-PTU-307, ECB/ECL-PTU-308
For ECB/ECL-PTU Series controllers, the maximum length between two consecutive devices
on the subnetwork data bus is 100 ft (30 m).
For controllers that support an ECx-Display, the maximum length of the Cat 5e cable subnet-
work data bus used to connect a controller to an ECx-display as a stub is 6.5 ft. (2m). The
maximum total length of the Cat 5e cable subnetwork data bus remains 600 ft. (180 m).
When other subnetwork devices are used, use an ECx-Subnet Adapter to connect to those
devices.
600 ft (180 m) Maximum Length
Typical ECB /
ECL Controller
Cat 5e Cable Subnetwork Bus
Light or Sunblind
Expansion Module
Typical Room Devices
ECx-Subnet
Adapter