Distech Controls ECB-VAV - 2-Wire Subnetwork Data Bus Shield Grounding Requirements

94 Network Guide
Allure Series sensor are set to ON. All other ECx-4XX I/O Extension Modules and Allure
Series sensors must have their EOL terminations set to OFF. This is shown below.
Figure 61: Setting the EOL Terminations on the Subnetwork Data Bus when Cat 5e Room Devices are used
2-Wire Subnetwork Data Bus Shield Grounding Requirements
The 2-Wire subnetwork data bus is a three-wire bus that has specific installation requirements.
The best protection against interference is to use properly grounded shielded cable for the 2-
Wire subnetwork data bus. For this, the ECx-4XX I/O Extension Modules on the 2-Wire sub-
network data bus must be daisy-chained together with the cable shield twisted together and
isolated with electrical tape at each ECx-4XX I/O Extension Module.
The shielding of the 2-Wire subnetwork data bus cable must be connected to the electrical
system ground at one point only, preferably at the ECB-600/ECL-600 as shown below.
Figure 62: ECB-600/ECL-600 - 2-Wire Subnetwork Data Bus Shielding
For use with an ECB-600 / ECL-600 Series Controller Only
Cat 5e Cable Subnetwork Bus
ON
EO L
OFF
- Last daisy-chained Allure
EC-Smart-Vue:
EOL Jumper is ON
- All other Allure EC-Smart-Vue:
EOL Jumpers are OFF
For Allure EC-Smart-Vue:
- Last daisy-chained ECx-4XX:
EOL Jumper is ON
- All other ECx-4XX:
EOL Jumpers are OFF
For ECx-4XX:
EOL OFF
EOL ON
Back of Allure
EC-Smart-Vue
Inside
ECx-4XX
2-Wire Subnetwork Bus
Typical ECx−4XX Series
Extension I/O Modules
Typical ECB−600 /
ECL−600 Controller
Typical ECx−4XX Series
Extension I/O Modules
ECB-600
ECL-600
SUBNET + SUBNET - SUBNET + SUBNET -
ECx-4XX ECx-4XX
SUBNET+ SUBNET -
2-Wire Subnetwork
Bus Cable
2-Wire Subnetwork Bus Cable
Shields: Isolate with electrical tape
2-Wire Subnetwork Bus Cable
Shields: Twist together and Isolate
with electrical tape
2-Wire Subnetwork
Bus Cable
Electrical
System
Ground