Z206855-0B
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Installation Guide
Power Monitoring
E31E Series
TM
4. Mechanically secure the RS-485 cable where it enters the electrical panel.
5. If using Modbus RTU or BACnet MS/TP protocol, connect a serial cable(s) from the RS-485 loop to the serial connector on the
E31E. Connect all RS-485 devices in a daisy-chain, and properly terminate the chain. Two sets of connections are provided
to simplify daisy-chain connections and enable retention of each wire. Follow all applicable wiring and termination
connection guidelines for the standard in use. Note that while both the the Modbus RTU and BACnet MS/TP standards identify
requirements for RS-485 line polarization/bias and termination, the value and placement of these resistors varies for each
standard. The E31E does not implement any RS-485 line polarization/bias or termination internally. For the RS-485 cable,
use shielded, twisted-pair wire, such as Belden 1120A, that is voltage-rated for the installation. The shield is not internally
connected to Earth Ground. Connect the shield to Earth Ground somewhere on the RS-485 bus (single point connection only).
RS-485
S
–
+
S
–
+
Belden 1120A or
equivalent
120
Ω
terminator
where specified
by the applicable
standard
WARNING: After wiring
the RS-485 cable, remove
all scraps of wire or foil
shield from the electrical
panel. Wire scraps coming
into contact with high
voltage conductors could
be DANGEROUS!
6. Connect an ethernet cable to a local PC. Secure a ferrite filter (included) around the ethernet cable to ensure the device meets
emission requirements. Use the PC to configure the gateway (next section of this document).
7. Once configured, disconnect the local PC. If desired (and the device is configured for operation on the network), connect the
E31E directly to the network for ongoing access to the GUI even if primarily using a serial protocol to access and control the
E31E.
Wiring (cont.)
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