True Heading AIS-CTRX - Channel Management Information Source Messages (NMEA 0183 ACS); AIS Alarm Messages (NMEA 0183 ALR)

AIS-CTRX Class B AIS Transponder Manual
• x7 = Power level control
• a3 = Information source
• x8 = In-Use Flag
• hhmmss.ss = Time of "in-use" change
Channel management information source messages (NMEA 0183 ACS)
This sentence is used in conjunction with the ACA sentence and identifies the originator of an ACA
message.
$--ACS,x,xxxxxxxxx, hhmmss.ss,xx,xx,xxxx*hh <CR><LF>
• x = Sequence Number , 0 to 9
• xxxxxxxxx =MMSI of originator
• hhmmss.ss = UTC of receipt of channel management information
• xx = UTC Day, 01 -31
• xx = UTC Month, 01 -12
• xxxx = UTC Year
AIS Alarm Messages (NMEA 0183 ALR, Text)
ALR message format
$--ALR,hhmmss.ss,xxx,A,A,c--c*hh<CR><LF>
• hhmmss.ss = Time of alarm (UTC)
• xxx = Unique alarm number
• A = Alarm condition
• A = Alarm acknowledge state
• c--c = alarm description, text
Alarms descriptions presented are:
• AIS: TX malfunction
• AIS: Antenna VSWR exceeds limit
• AIS: Rx channel 1 malfunction
• AIS: Rx channel 2 malfunction
• AIS: general failure
• AIS: no sensor position in use
• AIS: no valid SOG information
• AIS: no valid COG information
• AIS: 12V alarm
• AIS: 5V alarm
• AIS: Loss of serial interface integrity
• AIS: Background noise above -77dBm
1.1E 29 LD2103