NT921HDI & NT922HDI
2Pages

NAVITRON SYSTEMS LTD NT921HDI & NT922HDI Heading Data Interfaces The NT921HDI is available in two forms to convert Sin/Cos Heading signals received from proprietary compasses / fluxgate devices etc. to standard NMEA heading data. The resultant serial data accords with IEC 61162/1 and IEC 61162/2 (as preferred) and can be used as a heading input to a Navitron Autopilot System or for inputs to other proprietary equipment such as radar (stabilisation) or ECDIS etc. Input Signal:- Type NT921HDI Sin / Cosine (0 - 5Vdc range) Output Signal:- Type NT921HDI/1:This is the simpler form of interface which can be connected within a Navitron Autopilot System and uses the regulated power supplies available from the Autopilot Control Unit as it's power source. The PIC processor intelligent NT921HDI then decodes applied Sin/Cos Heading signal and converts the input signal to NMEA 0183 serial output data which is installation selectable for 4800 or 38400 baud and update rates of 1Hz or 10Hz as required. NT921HDI/2:- Single channel NMEA 0183 Heading Data. Installation Selectable 4800 / 38400 baud with 1Hz, 10Hz or 20Hz update rate combinations. This is a stand alone version of the Sin/Cos to NMEA converter and is suitable for direct connection to 11-40Vdc vessel power supply since voltage regulation is included in the NT921HDI/2 (Type 2) The single channel NMEA 0183 Heading data output signal is opto isolated to eradicate common mode problems and provides installation selectable update rates of 1Hz, 10Hz or 20Hz dependent upon the output baud rate selected (4800 or 38400). Type NT922HDI NMEA 0183 Heading data @ 4800, 9600, 19200 and 38400 baud NT922HDI:The NT922HDI provides conversion functions from NMEA Heading data to 5Vp/p Step by Step and from single channel NMEA Heading data to dual channel opto isolated NMEA outputs which are independently selectable to provide both baud rate and update rate conversions. Input Signal:- Suitable for stand alone 11-40Vdc power supply operation, the NT922HDI can be used in buffered NMEA to step repeater applications etc. and the baud rate conversion function provides a simple solution to many interfacing requirements involving equipment from different systems operating at different baud rates. Output Signal:Installation selectable 3, 6, 12 and 24 steps/degree (5Vp/p) & isolated dual channel NMEA Heading data @ 4800, 9600, 19200 or 38400 baud with update rate combinations 1, 8, 10, 20 & 40Hz The NT922HDI NMEA serial data outputs are available in two sentence types ($XXHDT or $XXHDG) which are derived and reliant upon the input data received. The outputs (opto isolated) can be connected to external "listeners" in RS422, RS232 and standard NMEA connection formats. NAVITRON SYSTEMS LTD (Registered in England No. 2607869) Osborn House, 25E Brockhampton Lane, Havant, Hampshire PO9 1JT TEL: (UK) 023 9249 8740 FAX: (UK) 023 9249 8783 (INT) +44 23 9249 8740 (INT) +44 23 9249 8783 E-mail: sales@navitron.co.uk Web: www.navitron.co.uk

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