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CLMD12 User's Manual
4 Operation
4.1 Manual Breaker Control
Breakers may be manually turned on and off via messages received over the NMEA 2000
network.
4.2 Automatic Breaker Control by Flash Function
The Flash Function allows control of a breaker to be periodic. Common uses of this function
include controlling a foghorn, automatically turning off a head fan or light after a set period of
time, etc. Three parameters dictate the behavior of the circuit and are set via the Maretron
N2KAnalyzer utility. A maximum of 15 flash table entries may be defined.
• Flash ON time: Duration of time the load is ON
• Flash OFF time: Duration of time the load is OFF
• Number of Cycles: Number of times to repeat the cycle – 0 to 255 (0 will cause the
cycle to be repeated indefinitely)
4.3 Automatic Breaker Control by Discrete I/O Function
When a device which transmits a 127501 Binary Status Report message is present on the
NMEA 2000 network or internal discrete inputs are utilized, the indicator states transmitted in
these messages can be configured to control the behavior of the breakers. 12 Discrete I/O's
from SIU and/or 7 on-board discrete inputs per CLMD12 can be programmed. One Discrete
I/O can control multiple breakers up to the box limit. The Discrete I/O state is maintained
independent of any breaker state. Therefore, if a breaker is being controlled from multiple
input signals (DIO's) an "out of state" situation is possible when input signals are switched.
Example: two wall switches are controlling the same light (breaker) – depending on the state of
the signal, a second touch of the switch may be required to obtain the desired action.
Discrete I/O Function
Always Turn ON
Always Turn OFF
Toggle ON/OFF
Brighten
Dim
Flash
Turn OFF w/Lock
Unlock
One Button Smooth High-
to-Low
One Button Smooth Low-
to-High
Page 28
Description
Turns the breaker ON when the monitored signal becomes active
Turns the breaker OFF when the monitored signal becomes active
An inactive to active edge on the monitored signal toggles the breaker from OFF
to ON or from ON to OFF
An inactive to active edge on the monitored signal increases the dimming
level by 1%
An inactive to active edge on the monitored signal decreases the dimming
level by 1%
An inactive to active edge on the monitored signal turns the breaker ON
and uses the assigned flash map
The breaker turns OFF and stays LOCKED as long as the monitored signal
is active. The breaker stays OFF but becomes UNLOCKED when the
monitored signal becomes inactive
Unlocks breaker (state does not change)
Single press changes breaker state. Press and hold wall switch to turn ON;
hold for High to Low voltage decrease (1% increments). Continuing to hold
will reset to 100% intensity and repeat.
Single press changes breaker state. Press and hold wall switch to turn ON;
hold for Low to High dimming level increase (1% increments). Continuing to
hold will reset to 5% dimming level and repeat.
Revision 1.6
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