MERLIN NX ROOM CONTROLLER – INSTALLATION & COMMISSIONING INSTRUCTIONS
15
EN1Z-1035GE51 R0319
set to 35 by default, thus guaranteeing that, on a BACnet
MS/TP bus with, e.g., 62 RxxN controllers, all of the other
RxxN controllers will be found. Both the property Max Master
and the property MAC ID are writeable properties that can be
changed. Specifically: "MAC ID" can be changed using
Niagara, while "Max Master" can be changed using Niagara
or any other BACnet-compatible engineering tools, e.g., with
BACShark.
NOTE:
It is not possible to configure a MAC ID outside the
range of 1…62.
BACnet MS/TP
#1
#2
#60
#62
#61
PLANT
CONTROLLER
LEGEND:
NON-RxxN CONTROLLER (WITH MANUAL MAC ADDRESSING)
RxxN (WITH AUTOMATIC MAC ADDRESSING)
Fig. 21. Automatic MAC addressing (scenario "A")
In scenario "A", 29 controllers with manually-assigned MAC
addresses (#1, #2, #3…#59, #60, #62 – MAC address #61
has thus been deliberately skipped) are already up and
running on the BACnet MS/TP bus. A single additional RxxN
is then connected to the bus and powered on.
RESULT:
The RxxN Controller requires approx. 28-31 sec to
automatically assign itself a compatible MAC address (#61),
and to complete various other firmware tasks before
becoming fully operational.
Scenario "A" and additional scenarios ("B" through "F") are
described in Table 7 below.
Table 7. Possible Auto MAC addressing scenarios
scenario
time
remarks
A: RxxN start-up time on
single BACnet MS/TP bus
after power-on (cold boot or
reset).
28-31
sec
61 non-RxxN controllers
(with manual MAC
addressing) are running; 1
RxxN is then added and
powered on.
B: Average start-up time for
all RxxN controllers on single
BACnet MS/TP bus.
1 min.
and 34
sec
Like "A," but with 8 non-
RxxN controllers; 54 RxxN
controllers are then added
and booted.
C: Time to recognize con-
flicting MAC address of added
non-RxxN controller.
21 sec
Like "B," but with 7 non-
RxxN controllers and 54
RxxN controllers; an
additional non-RxxN con-
troller with a conflicting
address is then added.
D: Time to recognize con-
flicting MAC address of added
non-RxxN controller while
auto MAC still in progress.
50 sec
Like "C," but with the addi-
tional non-RxxN controller
having a conflicting MAC
address added while auto
MAC still in progress.
E: Time for auto MAC when
additional RxxN controllers
are added in stages while
auto MAC still in progress.
30 sec
Like "B," but with RxxN con-
trollers added in stages.
F: Time for restart of RxxN
controllers and verification of
auto MAC addresses after
power-down.
17 sec
8 non-RxxN controllers and
54 RxxN controllers are
running; then power-down
and restart.
OPERATOR INTERFACES
LEDs
The controller features the following LEDs:
T2 R2 T1 R1
!
Fig. 22. Controller LEDs
Table 8. Description of LED behaviors
symbol
color
function, description
T2
yellow
Not used
R2
yellow
Not used
T1
yellow
LED indicating transmission of communication
signals via the BACnet MS/TP interface.
R1
yellow
LED indicating reception of communication
signals via the BACnet MS/TP interface.
!
yellow
Status LED indicating firmware problems,
hardware problems, etc. (see Table 9).
green
Power LED indicating firmware problems,
hardware problems, etc. (see Table 9).
Table 9. Status LED and power LED behaviors
#
Mode
Power LED (green)
Status LED
(yellow)
1
Power failure
Stays OFF
Stays OFF
2
Device error*
Stays ON
Stays ON
3
No application
ON/OFF (0.5 Hz)
ON/OFF (0.25 Hz)
4
Broken sensor
ON/OFF (0.25 Hz)
Stays ON
5
Short-circuiting
ON/OFF (0.5 Hz)
Stays ON
6
Auto-MAC
ON/OFF (1 Hz)
ON/OFF (0.5 Hz)
8
Unacknowledged
alarm
ON/OFF (2 Hz)
ON/OFF (2 Hz)
9
Normal operation
ON/OFF (0.5 Hz)
Stays OFF
*Please return the controller for repair.
Service Button
The Service Button is used to trigger dedicated events.
Table 10. Use of controller's Service Button
action
result
Button pressed 0.01 to 2 sec.
while controller running
Service Pin (UID) broadcast on
the BACnet MS/TP bus.
Button pressed > 10 sec. while
controller powering up
Password is reset.
Button pressed 0.01 to 5 sec.
while controller powering up
Auto MAC addressing procedure
reinitiated.