Samyung ENC SI-30A, Manual Instruction

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4 6
6. Appendix
6-1 NMEA sentences used
The ports on the SI-30A transponder accept and output different combinations of NMEA
sentences as follows:
Port Input sentences Output sentences
Main, Display and Aux
(“Presentation ports”) ACA, ABM, BBM, ACK, AIR,
AIQ, LRI, LRF, VSD, SSD ABK, ACA, ACS, ALR, LRI, LRF, LR1,
LR2, LR3, SSD, TXT, VDO,VDM, VSD
Long Range LRI, LRF LRI, LRF, LR1, LR2, LR3
S1, S2, S3
(“Sensor ports”) DTM, GBS, GGA, GLL, GNS,
HDT, RMC, ROT, VBW, VTG,
THS, OSD None
6-2 Alarm Messages
The transponder may generate various alarm and information messages that appear as pop-
ups on the display. Messages categorised as "alarms" also cause the transponder to generate
an audible or visual alarm (depending on the installation) and must be acknowledged on the
display unit in order to clear the alarm.
Tx malfunction
This indicates that there is a problem with the transponder. The occasional occurrence of this
alarm may be caused by transient conditions and does not necessarily indicate a permanent
problem. However, if this alarm occurs on a regular basis you should take action to have your
installation checked by an authorised service agent.
Antenna VSWR exceeds limits
This indicates that there is a problem with the antenna. The transponder is likely to be still
operational, although its performance may be impaired. The occasional occurrence of this
alarm may be caused by transient conditions and does not necessarily indicate a permanent
problem. However, if this alarm continues to occur you should take action to have your
installation checked by an authorised service agent.