Wiring (Cont’)
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ETNC24-SUPER-MDB-01
Owner’s manual & Technician Settings
Pg. 7
JMP1
S5
A
B
First and last devices in the communication line
should be terminated with a 120
Ω
resistor to
prevent signal reflection.
JMP1 – End of line jumper
Short – End of line
Open – Not end of line (default)
Jumper
Short
Jumper
Open
End of line jumper
Do not run communication cables in the same conduit of high voltage (24VAC) electrical cables and if
you cross an electrical cable, cross at a 90° angle. Mixing high and low voltage lines may cause
serious communication problems.
In order to prevent any potential contact between high and low voltage
wires, group the high voltage wires together using a non conductive cable clamp, as close as possible
to the thermostat, and repeat the procedure on the low voltage wires (A, B, 0, To, IN).
Communication Network
RS485
MODBUS
Twisted shielded pair cable
(SFTP 120
Ω
@1MHz), 22AWG
Connect the shield to ground at one end of
communication line
Tested
ground
Communication
network
Shield
ETN
A B
ETN
A B
ETN
A B
The IN,0 Dry contact , normally open terminals can be used to connect any contact input (i.e window
contact or door switch).
When the contact is closed, the thermostat will either turn OFF or switch to Economy set points
(please refer to technician settings).
Contact Input