APPENDIX 6: EXTERNAL INTERFACE MODULES
The external interface modules are supplied for mounting on 35mm “Top Hat” style DIN Rail. The
DIN Rail is mounted in the location desired and the external interface unit is mounted on the rail.
DIN Rail is not supplied with the external interface units.
Figure A6 -1 shows the typical dimensions of the DIN Rail required for mounting an external
interface. It is acceptable to use DIN Rail that is deeper than 7.5mm (15mm deep DIN rail is
commonly available), as long as the 35mm width is maintained.
Figure A6 - 1 DIN Rail
A6.1 External Data Interfaces
The External Data Interfaces, used to sense data signals from ship’s equipment in order to
provide 61162/NMEA0183 compliant data sentences, are recorded via the NMEA Modules
described earlier in this documentation. Non-compliant data can be recorded using 1 of the
following interfaces:
A6.1.1 DataAnalog
The DataAnalog Input Module monitors the status of eight (8) analog input signals and indicates
the voltage or current which corresponds to the equipment setting on each input channel via an
NMEA-0183/IEC 61162 format data sentence transmitted once per second. The DataAnalog
interface has eight (8) channels and can simultaneously monitor signals from four (4) separate
systems while maintaining isolation between them. This interface is ideally suited to measure the
electrical indications for order and response from four (4) shipboard systems (i.e., Rudder
Order/Response, Engine RPM Order/Response, Pitch Order/Response, Bow Thruster Order and
Response).
A6.1.2 DataDiscrete
Discrete inputs can be monitored via Rutter Technologies’ DataDiscrete interface unit. Discrete
inputs are data items recorded simply as open/closed or on/off. These discrete inputs reflect their
status by the presence or absence of discrete voltage levels or by the closure of “dry” relay
contacts. The DataDiscrete input module monitors discrete input points and outputs an NMEA-
0183/IEC 61162 format data sentence to represent them. This output is connected to the VDR-
100G3 through a NMEA input channel on the NMEA Module. The DataDiscrete interface is a
microprocessor-based unit that incorporates 24 opto-isolated inputs arranged in 4 banks of 6
(with each bank having its own common return).
VDR-100G3/G3S Installation Manual 06/10/2008
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