Module Wiring
The recommended module network wiring specifications are:
⦁
Belden 9842 or equivalent
⦁
24AWG twisted pair with characteristic impedance of 120 ohm
⦁
Maximum total length of cable is 900m (3000ft)
⦁
CAT5e / CAT6 are also supported for data transmission when using ground in the same cable (to a maximum
length of 100m (328ft))
Warning:
Unused wires in the cable must not be used to carry power to other devices.
End of Line (EOL) Resistors
The 330 ohm EOL (End of Line) resistor provided in the accessory bag
must
be inserted between the NA and NB
terminals of the
first
and
last
modules on the RS-485 network. These are the modules physically located at the
ends of the RS-485 network cabling.
330R
330R
First Module on RS-485 Network
Last Module on RS-485 Network
To
Next
Module
From
Previous
Module
NA
N+
N-
NB
NA
N+
N-
NB
The PRT-MNR2-DIN Module Network Repeater would typically be the first module on the RS-485 module
network, but this may not always be the case.
PRT-MNR2-DIN | Protege Module Network Repeater | Installation Manual
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