IALA A-126 GLA message format
| Parameter | No. of bits | Description | MANDO |
|---|---|---|---|
Message Id |
6 | Identifier for this message 6; always 6. | 6 |
Repeat Indicator |
2 | Used by the repeater to indicate how many times a message has been repeated. 0 – 3; default = 0; 3 = do not repeat any more. | 0 |
Source ID |
30 | MMSI number of source Unit | Real AtoN station MMSI |
Sequence Number |
2 | 0 ~ 3 | 0 |
Destination ID |
30 | MMSI number of destination Unit. | Configuration via AID,D. |
Retransmit Flag |
1 | Retransmit Flag should be set upon retransmission: 0 = no retransmission = default 1 = retransmitted. |
0 |
Spare |
1 | Not used. Should be zero. | 0 |
DAC |
10 | Destination Area Code. Default: 235 (UK & NI) or 250 (ROI) |
235 |
FI |
6 | Function Identifier Default: 10 for this GLA standard message |
10 |
Analogue |
10 | 0.05– 36V 0.05V step Supply voltage to AIS Unit 0 – Not Used |
ADC1 |
Analogue |
10 | 0.05– 36V 0.05V step Supply voltage to AIS Unit 0 – Not Used |
ADC2 |
Analogue |
10 | 0.05– 36V 0.05V step Supply voltage to AIS Unit 0 – Not Used |
ADC3 |
AtoN Status Bits |
5 | 4\ / 00 – no RACON installed; 01 – RACON not monitored 3 / \ 10 – RACON operational; 11 – RACON ERROR 2 \ / 00 – no light or no monitoring; 01 – Light ON 1 / \ 10 – Light OFF; 11 – Light ERROR 0 0 - Good Health, 1 - Alarm |
Same as AIS message 21 |
Status Bits |
8 | bit[7] Digital Input Off/On bit[6] Digital Input Off/On bit[5] Digital Input Off/On bit[4] Digital Input Off/On bit[3] Digital Input Off/On bit[2] Digital Input Off/On bit[1] Digital Input Off/On bit[0] Digital Input Off/On |
N/A N/A N/A N/A N/A N/A N/A Digital Input |
Off Position Satus |
1 | Off position or On position 0: On position 1: Off position |
Same as AIS message 21 |
Spare |
4 | For future use. Should be zero. | 0 |
| Total of bits | 136 | Occupies 1 slot. | - |