NoLand Engineering, Inc.
N183-41 Serial Multiplexer Installation & Operation Manual
Page 2 of 6
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Great Lakes Marine Specialties
Great Lakes Marine Specialties
Great Lakes Marine Specialties
Great Lakes Marine Specialties
800
800
800
800----821
821
821
821----0207 USA & Canada
0207 USA & Canada
0207 USA & Canada
0207 USA & Canada
952
952
952
952----925
925
925
925----1285 All other Countries
1285 All other Countries
1285 All other Countries
1285 All other Countries
Power/Ground Connection
The power (+12V) and ground (GND) connections are located at one end of the terminal
strip. It is recommended that these be connected to the same power source (e.g., circuit
breaker) such as the ships instruments and/or computer, since it will be used only when
both the instruments and computer are also in use. There is no ON/OFF switch provided
on the N183-41 due to its low power consumption.
NMEA 0183 listener Connections
The N183-41 input connections are labeled "IN1" through "IN4". When connecting in-
struments to the N183-41, it is important to maintain the proper polarity of the lines.
Connect the "A" terminal of each input port of the N183-41 to the corresponding "+" or
"A" output terminal of each instrument. Connect the "B" terminal of each input port of the
N183-41 to the corresponding "-" or "B" output terminal of each instrument.
CAUTION: Do not interconnect the "B" terminals of the N183-41 and instruments as
some instruments use single ended drivers and some use differential. This will not dam-
age the N183-41, but could cause erratic operation and may damage the instruments.
NOTE: If a particular instrument has only
one NMEA terminal, it can be assumed that
it is a single ended active line. In this case,
connect this line to the "INA" terminal of the
N183-41 and connect the corresponding
"INB" terminal of the N183-41 to instrument
ground.
NMEA 0183 talker Connection
The N183-41 also features a talker (TLK)
port which may be connected to all instru-
ments with an NMEA 0183 listener port
such as a LORAN or GPS receiver. Con-
nection of this port follows the same con-
vention as above except that any shield
connection is now made at the N183-41
rather than at the instrument. Also note that
multiple listeners may be connected to this
(TLK) talker port.
RS-232 Computer Connection
For most applications the N183-41 RS-232
output (RX, COM, and TX), will be con-
nected to a computer via the DB-9 connec-
