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3 Environmental conditions
All units of the system meet the environmental conditions specified in IEC 60945.
Unit Protected Exposed Submerged
Transducer/Bottom parts X
1)
Sig.Processor X
Sig.Distributor X
Display (flush surface mounted) X X
2)
Display (mounted in BMB) X
1) The transducer cable is not intended to be installed Submerged.
2) Front panel for Display provides watertight mounting to panel/console surface.
4 Interfaces
4.1 Serial interface & sentences
All serial interfaces comply with IEC 61162-1 Edition 4.0 2010-11 (NMEA 0183 standard
version 4.00). Transmitted sentences are $VDVBW, $VDVLW and proprietary PSAL
sentences for JLN-900 speed log.
4.1.1 NQA-4480 Sig.Distributor
NQA-4480 is intended to be connected to other systems. It has 23 serial outputs fed from 13
separately buffered drivers. NQA-4480 has various options to perform signal processing and
calculations from the speed log and other inputs. Please refer to NQA-4480 Technical Manual
for details.
4.1.2 NJC-80 Sig.Processor
NJC-80 is connected to NQA-4480. It has one serial output from SOG-unit and one serial
output from STW-unit. Both serial outputs should be connected to NQA-4480 to obtain full
redundancy between the STW- and SOG-units of the speed log.
One serial input channel is used to provide remote access for calibration and service.
4.1.3 NWW-82 Main Display
The Speed Log Master Display has one serial input and one serial output connected to NQA-
4480 transferring the user interface for calibration and configuration to NJC-80.
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