Principle Of Operation - JRC JLN-900 Installation And Instruction Manual

1.3 Principle of operation

The Sig. Distributor distributes data between connected units (instruments etc.) in the speed log
system, as well as it transmits speed and depth data to external systems. Serial speed/depth data
from one or more speed logs is received by the Sig. Distributor and decoded to generate serial
data as well as speed pulse signals. A large number of output connections are programmable.
However, a default configuration is active on delivery and shall be used whenever possible.
The unit is equipped with a power supply, able to provide power to NWW-82/85 displays.
The Sig. Distributor is also used for docking log calculations. The output from a Rate Of Turn
gyro can be connected to the Sig. Distributor via serial (NMEA) or analogue input. From this
input and the received SOG from the speed log, the Sig. Distributor calculates transversal
speeds of both ends of the ship, which can be fed to NWW-85 docking displays.
Remote Control is used to access the menu system in the Sig. Distributor as well as in
connected speed logs. This Main Display shall be labeled as a Speed Log Master Display
according to instructions in the NWW-82 Main Display chapter.
The Sig. Distributor is equipped with an Ethernet connection (RJ45) to access the Sig.
Distributor web-interface. This web-interface can be used to access the Sig. Distributormenu
system, display in/out going NMEA messages, display diagnostic lists, and for other service
purposes.
The Sig. Distributor software is contained in Flash-memory, which can be updated on board
from a USB memory stick or using the serial D-sub.
6-4