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The RMM2 has two sets of terminals for con-
nections to the RS-485 bus. One terminal block
allows the RMM2 to connect to the RS-485 bus,
the second allows a continuation of the bus
to other RMM2 units on the network. Observe
polarity, which is indicated on the RMM2.
Connect the incoming RS-485 bus to the set
of terminals marked "IN", observing the polar-
ity noted on the cover of the RMM2; use the
terminal marked "S" for the shield of the RS-485
cable. Connect the continuation
of the RS-485 bus to the set of terminals
marked "OUT" in the same manner (not
required for the last RMM2 in the network).
Important: Do not connect the shield of the
RS-485 cables to the enclosureʼs grounding
terminal. Connect the shield only to the RMM2
terminals provided. To avoid the potential
for spurious ground loops, the RS-485 cable
shield should be connected to ground only in
the Moni200N unit. For the last RMM2 in the
network, terminate the RS-485 bus by removing
the shorting block on jumper location J17 from
2–3 and placing it across pins 1–2.
E. Initialize or Update the Moni200N Network and Assign Settings for
Each RTD
RMM2 units are monitored by a central
Moni200N control and monitoring unit. Its
system software enables you to trigger the
Moni200N to recognize changes to the RMM2
and RTD configuration. Until this software is
run, the Moni200N will not monitor new RMM2s
or RTD.
MoniTrace 200N
RS-485 bus
Shielded, twisted pair
Moni-RMM2
Moni-RMM2
(last in network)
1 2 3
J17
J16
3 2 1
12. Energize all RMM2s in the network.
Confirm that the RS-485 network is complete
(all RMM2 units and the Moni200N are con-
nected to the RS-485 bus), that the power to
each unit has been turned on, and that at least
one RTD is properly connected to one of the
RTD inputs.
Moni-RMM2
RS-485 bus
Shielded, twisted pair
Moni-RMM2
1 2 3
J17
J16
3 2 1
7
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