NoLand Engineering, Inc.
N183-41 Serial Multiplexer Installation & Operation Manual
Page 1 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
General Description
Each N183-41 Serial Multiplexer provides four NMEA-0183 opto-isolated listener ports
and one talker port. Multiple units may be interconnected to provide additional listener
ports (i.e., two units will provide seven listener ports and three units will provide ten lis-
tener ports).
The talker port enables the computer to send "query" messages to instruments
equipped with a "listen" port, such as a LORAN or GPS receiver. The Talker port util-
izes a standard RS-422 differential driver as specified by the Standard.
A standard RS-232 interface is provided for connection to the host computer. The de-
fault baud rate is 4800 so that is also NMEA-0183 compatible. The N183-41 is fully
compliant with the National Marine Electronics Association NMEA-0183 Standard for
Interfacing Marine Electronic Devices, Version 2.00, 1992.
Installation
Installation of the N183-41 requires connection to a power source (8-16VDC), the in-
struments, and the computer. All connections are made via a 16-pin terminal strip as
detailed below: (See Fig. 1)
