2-Wire Subnetwork Data Bus Topology And End-Of-Line (Eol) Terminations - Distech Controls ECL/ECB-PTU Series User Manual

Distech Controls recommends the cable shown below.
Table 24: Distech Controls Recommended Cable Types for the 2-Wire Subnetwork Data Bus
Cable Type
300 meters (1000 feet), 24 AWG
Stranded, Twisted Pair Shielded Cable -
FT6, Rated for Plenum Applications
2-Wire Subnetwork Data Bus Topology and End-of-Line (EOL)
Terminations
The EOL termination settings for the 2-wire subnetwork data bus will vary depending on
whether any Allure Series sensors are connected to the controller's Subnet Port or not. By
default, the EOL termination on the ECx-4XX devices and Allure Series sensors are factory-
set to OFF.
When ECx-4XX I/O Extension Modules are connected to an ECB-600 / ECL-600 controller's
Subnet+ and Subnet connectors, only the EOL terminations of the ECB-600 / ECL-600 and
the last ECx-4XX are set to ON. All other ECx-4XX I/O Extension Modules must have their
EOL terminations set to OFF. This is shown below.
For the 2-wire subnetwork data bus, only a daisy-chain topology is acceptable and
T-connections and routers are not allowed.
Figure 60: Setting the EOL Terminations on the ECx-4XX Subnetwork Data Bus
Typical ECB-600 /
ECL-600 Controller
Typical ECB−600 /
ECL−600 Controller
Inside
ECx-4XX
EOL OFF
EOL ON
For ECB-600 / ECL-600, the
Subnetwork EOL is set to ON
When ECx-4XX I/O Extension Modules are connected to an ECB-600 / ECL-600 controller's
Subnet+ and Subnet connectors and with one or more Allure Series sensor(s) are connected
to the controller's Subnet Port, only the EOL terminations of the last ECx-4XX and the last
Network Guide
Part Number
CB-BACN6BL1000
Typical ECx-4XX Series Extension I/O Modules – For use
with an ECB-600 / ECL-600 Series Controller Only
Typical ECx−4XX Series
Extension I/O Modules
2-Wire Subnetwork Bus
For ECx-4XX:
- Last daisy-chained ECx-4XX:
- All other ECx-4XX:
Subnetwork Installation Guidelines
O.D. (Ø)
3.75mm (0.148 in.)
Typical ECx−4XX Series
Extension I/O Modules
Inside
ECx-4XX
EOL OFF
EOL ON
EOL Jumper is ON
EOL Jumpers are OFF
93