Onwa KR-1338, Service Manual

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Heading and NAV data
Heading data in NMEA format HEADING DATA (HDT, HDG, HDM, VHW)and
NAV data (NMEA-0183)can be input from any NMEA input connection. THE
data from the KEY board(KEY 0912) to P8#3 of MAIN board .
NOTE:
1.If only one NMEA signal input may select any connection, if several connections
have time the signal input, be please main and the most commonly used signal
meets in the connection 1, because the complete signal's input is 1 comes the
synchronization by the connection, i.e. the connection 1 signal is fastest;
2.The NMEA signal after or before radar starting in may, but in signaling process,
if the NMEA port 1 loss of signal, will possibly cause other port data not to be
able to transmit normally. Must remove this kind of condition only to be able again
starting.
Turning on/off antenna rotation
The SPU board controls antenna rotation. In normal operation, the antenna
rotates during the TX condition. However, the antenna can be stopped during
the TX condition thru the Installation setup menu.
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