Page 45 of 77
SKIPPER Electronics AS
Edition: 2017-06-12
GDS102 Operation and Installation Manual
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Chapter: 3. Installation
Interfacing
NMEA interface
The GDS102 NMEA outputs provide NMEA 0183 format information for other equipment with NMEA
0183 inputs. Baud rate is 4800 or 9600, 8 bit, no parity. Several messages may be selected on screen
10 (see “Fig. 2.11. Screen 10. NMEA control screen.” on page 23) and the enabled messages are
transmitted with a maximum interval of one per second. The NMEA inputs accept speed, position,
heading and UTC time messages from various navigators and compasses. The NMEA outputs and
inputs are available on the XJ402 connector on the external panel. See “Fig. 3.5. Data Communication
Interfaces.” on page 42, “Fig. 3.6. Data Communication Interfaces.” on page 43, “Fig. 3.8. Terminal
board connections” on page 48 and “Fig. 4.1. nmea connector XJ402.” on page 55 for more details.
Each of the outputs can supply more than 20 mA and can therefore drive at least 10 other standard
NMEA 0183 inputs.
Note: The factory setting of jumper JP400 on the terminal board (underneath the dual transceiver PCB,
see “Fig. 3.8. Terminal board connections” on page 48) is 1 to 2, providing two individually controlled
NMEA outputs. If the jumper is moved in position 2 to 3, both outputs are controlled (baud rate and
scope of transmitted sentences) by the settings of NMEA PORT 2 on screen 10. If the jumper is removed,
only one NMEA output is available (NMEA PORT 2). In the last case, the settings for output of COM
PORT 1 have no meaning. Both NMEA inputs are always available and individually programmable
(baud rate) regardless of the setting of JP400.
Alarm relay
An alarm relay is provided for interconnection to external alarm systems when alarm setting in
“Screen13” is set to ALR(B). This relay is normally energized, and is released by shallow alarm
condition.
In ALF and ALR(A) this relay may be used as power failure warning.
See “Fig. 3.8. Terminal board connections” on page 48, “Fig. 3.10. Input/Output Circuitry 2” on page
50 and “Fig. 3.11. Input/Output Circuitry 3” on page 51 for connection details.
The terminals have the following meaning:
J100 Symbol J100 # Description
AL COM 3 Common terminal.
AL NO 4 Normally open contact.
AL NC 5 Normally closed contact. (Normal = “No alarm” condition)
External alarm reset input
In ALR(B) the external alarm relay and local audio alarm can be reset externally by a potential free
contact* connected to REMOTE KEY+/- inputs (J100 pin 9 and 11) on the terminal board. If an optional
remote keyboard is used, external reset button can be connected in parallel with the keyboard, or the
remote keyboard can be used for external alarm reset.
* A potential free contact is essentially an electronic galvanically isolated switch which closes when it is
active.
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