Distech Controls ECL/ECB-PTU Series User Manual page 83

room devices and ECx-4XX Series I/O Extension Module EOL terminations are factory set to
OFF (except for the EC-Multi-Sensor).
For the Cat 5e Cable subnetwork data bus, only a daisy-chain
topology is acceptable and T-connections are not allowed. For the
EC-Multi-Sensor and ECx-Display, an optional ECx-Subnet
Adapter (Y-splitter) is available to facilitate the daisy-chain connec-
tion of these devices. The male-end of the ECx-Subnet Adapter
must be connected directly to the device and its length cannot be
extended.
Figure 50: An ECx-Subnet Adapter (Y-Splitter)
The ECx-Subnet Adapter is also used with a controller to connect
to an ECX-Display and to one or more room devices. See
47. In this scenario, the male-end of the ECx-Subnet Adapter must
be connected directly to the controller's Subnet Port and its length
cannot be extended.
EOL Terminations for the ECB/ECL-VAV Series, ECB/ECL-103 to -400 Series,
and ECB/ECL-PTU Series Controllers
When one or more room devices are connected to the Subnet Port of an ECB/ECL-VAV
series, ECB/ECL-103 to -400 Series, or ECB/ECL-PTU Series controllers, only the EOL termi-
nations of the last room device is set to ON. All other room devices on the subnetwork data
bus must have their EOL terminations set to OFF. The controller must be the first device on
the Cat 5e Cable Subnetwork data bus as its internal EOL termination is permanently enabled.
The ECx-Display does not have any EOL terminations to be set and as such should not be
installed as the last device on the subnetwork bus. See
Network Guide
Subnetwork Installation Guidelines
Figure
Figure 47.
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