Installation Guide
Power Monitoring
Series 4100 Modbus
TM
17
RS-485
Communications
Daisy-chaining Devices to the Power Meter
The RS-485 slave port allows the power meter to be connected in a daisy chain format with up to 32 devices, assuming a Leviton Energ y
Monitoring HUB as the master device.
120
Ω terminator on the first and last
device of the daisy chain
–
S
Notes
Shield wire
•
The terminal
’s voltage and current ratings are compliant with the requirements of the EIA RS-485 communications
standard.
•
The RS-485 transceivers are ¼ unit load or less.
•
RS-485+ has a 47 k
Ω pull up to +5V, and RS-485- has a 47 kΩ pull down to Shield (RS-485 signal ground).
•
Wire the RS-485 bus as a daisy chain from device to device, without any stubs. Use 120
Ω termination resistors at each
end of the bus (not included).
•
Shield is not internally connected to Earth Ground.
•
Connect Shield to Earth Ground somewhere on the RS-485 bus.
For all terminals:
•
When tightening terminals, apply the correct torque: 0.37 to 0.44
ft·lb (0.5-0.6 N·m).
•
Use 14-24 gauge (2.1-0.2 mm
2
) wire.
0.37
–0.44 ft•lb
(0.5
–0.6
N•
m)
