nuova marea ltd
marine electronics & design
Address: 26 Mirtidiotissis str, Kastella, 18533 Piraeus, Greece
Tel.: +30.210.4134628, +30.210.4134698, Fax: +30.210.4134814
P a g e
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Power Supply
The NM-251A can be powered within the range of 10-35 VDC. The nominal voltage of 24 Vdc is advised
for powering the device in normal operation.
Power input port has a protection for incorrect polarity connection of the supplying voltage.
LED Indicator sequence
Inb LED
ON: Currently sampling from secondary port Inb
Ina LED
ON: Currently sampling from primary port Ina
Out 3/4 LED
Flashing indicates data transmission to output port 3 and 4
Out 1/2 LED
Flashing indicates data transmission to output port 1 and 2
Out5 LED
Flashing indicates reception from RS-232 port and transmission to Out5 port
Dip Switch Settings
Configuration
Input – Output
routing
Functionality Description
SW
1
SW
2
SW
3
SW
4 J5 J6
Out
1/2
Out
3/4
RS
232
Out
5
OFF X OFF OFF 1-2 1-2
Ina
or
Inb
RS
232
RXD
Selects input priority encoding mode. Ina or Inb is
transmitted to Out 1-4 and RS232. Out5 is converting RXD
channel from RS232. Baud rate at 4.800 bps
OFF X
OFF OFF 1-2 1-3
Ina
or
Inb
Selects input priority encoding mode. Ina or Inb is
transmitted to Out 1-5 and RS232. Baud rate at 4.800 bps
(default).
OFF X OFF OFF 1-3 1-2
Ina
or
Inb
RS
232
RXD
Selects input priority encoding mode. Ina or Inb is
transmitted to Out 1-4 and RS232. Out5 is converting RXD
channel from RS232. Baud rate is free up to 38.400 bps.
CPU does not process the input signals.
OFF X OFF OFF 1-3 1-3
Ina
or
Inb
Selects input priority encoding mode. Ina or Inb is
transmitted to Out 1-5 and RS232. Baud rate is free up to
38.400 bps. CPU does not process the input signals.
ON OFF OFF OFF 1-2 1-2 Ina Inb Ina
RS
232
RXD
Selects transmission from Ina to Out1/2 and RS232 and
from Inb to Out 3/4. Out5 is converting RXD channel from
RS232. Baud rate at 4.800 bps.
ON OFF OFF OFF 1-2 1-3 Ina Inb Ina Ina Selects transmission from Ina to Out1/2, RS232 and Out5
and from Inb to Out 3/4. Baud rate at 4.800 bps.
ON OFF OFF OFF 1-3 1-2 Ina Inb Ina
RS
232
RXD
Selects transmission from Ina to Out1/2 and RS232 and
from Inb to Out 3/4. Out5 is converting RXD channel from
RS232. Baud rate is free up to 38.400 bps. CPU does not
process the input signals.
ON OFF OFF OFF 1-3 1-3 Ina Inb Ina Ina
Selects transmission from Ina to Out1/2, RS232 and Out5
and from Inb to Out 3/4. Baud rate is free up to 38.400
bps. CPU does not process the input signals.
ON ON OFF OFF 1-2 1-2 Ina Inb Inb
RS
232
RXD
Selects transmission from Ina to Out1/2 and from Inb to
Out3/4 and the RS232. Out5 is converting RXD channel
from RS232. Baud rate at 4.800 bps.
ON ON OFF OFF 1-2 1-3 Ina Inb Inb Inb
Selects transmission from Ina to Out1/2 and from Inb to
Out3/4 and Out5 and RS232. Baud rate at 4.800 bps.
ON ON OFF OFF 1-3 1-2 Ina Inb Inb
RS
232
RXD
Selects transmission from Ina to Out1/2 and from Inb to
Out 3/4 and RS232. Out5 is converting RXD channel from
RS232. Baud rate is free up to 38.400 bps. CPU does not
process the input signals.
ON ON OFF OFF 1-3 1-3 Ina Inb Inb Inb
Selects transmission from Ina to Out1/2 and from Inb to
Out 3/4 Out5 and RS232. Baud rate is free up to 38.400
bps. CPU does not process the input signals.
Note: SW-3 and SW-4 are intended for future use and should not be configured
Table 1: NM-251A Configuration