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Terminating
Resistor
Important Notes and Recommendations
1. RS-485 Booster
• Use of a RS485 Booster does not extend the max wire length between devices, but instead strengthens the communication
• To regulate power, Legrand recommends adding a 120 ohms (1/4 W) terminating resistor to the network cable in the last open
RS485 Power Panel port. The QIS Power Panel ships with this resistor attached. Remove it when daisy-chaining to another
Power Panel.
2. Wire length limitations are to ensure reliable data communication, not voltage drop.
3. Existing wiring can be retrofit if it is 18-24 AWG, a characteristic impedance of 120 Ohms, and at least 4 conductors.
The available QIS Wiring Adapter translates communication and power without through a simple connection (2 per cable
recommended).
4. The following wired system "Do's and Don't's" should be considered to ensure system reliability:
• Do check and prevent cabling issues, such as cable / connector damage, improper wiring, and improper termination. If you do
not posses a QIS Wire Tester, request one from Customer Service to help catch and prevent wiring issues on the project.
• Do consider an RS-485 booster, if necessary, per the guidelines above.
• Do consider adding a suitable battery backup and / or surge protection as a preventative to power surge, lightning strike, or
power outage.
• Don't exceed the recommended wire lengths.
• Don't splice/split cables to connect additional devices. There should be one device per connection.
• Don't use external power panel and communication panels.
QIS WIRED COMMUNICATION
QIS Devices
QIS Power
(up to 8 per panel)
+ Comm Panels
2
PoE Network
Switch
RS-485
Booster
InFusion
Controller
Powered RS-485
End-of-line
(up to 150 ft. / device)
terminator
RS-485 Network
(up to 1000 ft. / segment)
IP Network
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