MERLIN NX ROOM CONTROLLER – INSTALLATION & COMMISSIONING INSTRUCTIONS
The unit can be mounted on floors, walls, and ceilings in any
desired orientation. (See also section "Ambient
Environmental Limits" on pg. 27 for temperature range
restrictions with floor/ceiling mounting.)
The unit is mounted by inserting optional screws
(recommended: DIN EN ISO 7049 – ST4,2x22 – C – H)
through the corresponding screwing noses.
DIN EN ISO 7049 – ST4,2x22 – C – H
Fig. 7. Drilling template (view from above)
After mounting the unit onto the wall, snap the appropriate
terminal protection covers (see Fig. 4 and Fig. 5 on pg. 2) into
place onto the housing by hand.
NOTE: In the case of wall-mounting, optional terminal pro-
tection covers (in the case of the RLxN [large
housings]: IRM-RLC; in the case of the RSxN [small
housings]: IRM-RSC) must be installed in order to
comply with IP30.
The covers can be fixed into place using optional screws
(recommended: DIN EN ISO 7049 – ST2,9x9,5 – C (F) – H).
To remove a cover, place a screwdriver in the two leverage
slots (marked with arrows) and pry it loose.
For a complete list of all terminals and a description of their
functions, see Table 2 and Table 6.
NOTE: All terminal blocks capable of carrying either low
voltage or line voltage are orange-colored.
The delivery includes a plastic bag containing additional,
removable terminal blocks for BACnet MS/TP and Sylk
The controller is powered by 230 VAC, and is equipped with
differing numbers of triac outputs, relay outputs, etc. capable
of being configured in a variety of ways. See Table 1 on page
Every controller features a terminal assignment label on the
top of the housing.
Power Supply Terminals
Power is supplied via an orange-colored fixed screw-type
terminal block (terminals 1+2).
See also section "Power Supply" on pg. 11.
Input / Output Terminals
The controller features rows of terminal blocks on the top and
In the case of the RLxN (large housing), the controller has
double rows of analog outputs (AOs) and universal inputs
(UIs) at the top and a single row of binary outputs (BOs) –
triacs (TRs) and relay outputs (ROs) – at the bottom.
In the case of the RSxN (small housing), the controller
has a single row of analog outputs (AOs) and universal
inputs (UIs) at the top and a single row of binary outputs
(BOs) – triacs (TRs) and relay outputs (ROs) – at the
NOTE: According to VDE guidelines, it is not allowed to mix
low-voltage and high-voltage signals on the relays
See also section "I/O Terminals" on pg. 22.
All models of the controller feature the following communi-
A Sylk Bus interface (RSxN: terminals 20 and 21; RLxN:
terminals 30 and 31), for connection to TR40x/42x Wall
An isolated RS485 interface (RS485-1) for use with
BACnet MS/TP (RSxN: terminals 40, 41, and 42; RLxN:
terminals 62, 63, and 64);
An RJ45 connector for connection of the BACnet WiFi
A non-isolated RS485 interface (RS485-2), for use with
Modbus (RSxN: terminals 23, 24, and 25; RLxN: terminals
26, 27, and 28).