mcmurdo Smartfind M5, Руководство по установке и обслуживанию, Страница: 50 / 52

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A.6.9 TXT – Text Transmission
For the transmission of short text messages. Longer text messages may be transmitted by
using multiple sentences.
$--TXT,xx,xx,xx,c--c*hh<CR><LF>
Field No. Format Description Remark
1 xx Total number of sentences
2 xx Sentence number
3 xx Text identifier
4 c--c Text message
A.6.10 VDM – AIS VHF Data-Link Message
This sentence is used to transfer the entire contents of a received AIS message packet, as
defined in ITU-R M.1371 and as received on the VHF Data Link (VDL), using the “six-bit”
field type.
!--VDM,x,x,x,a,s—s,x*hh<CR><LF>
Field No. Format Description Remark
1 x
Total number of sentences needed to
transfer the message
2 x Sentence number
3 x Sequential message identifier
4 a AIS channel
5 s—s Encapsulated ITU-R M.1371 radio message
6 x Number of fill-bits
A.6.11 VDO – AIS VHF Data-Link Own-Vessel Report
This sentence is used to transfer the entire contents of an AIS unit’s broadcast message
packet, as defined in ITU-R M.1371 and as sent out by the AIS unit over the VHF data link
(VDL) using the “six-bit” field type.
!--VDO,x,x,x,a,s—s,x*hh<CR><LF>
Field No. Format Description Remark
1 x
Total number of sentences needed to
transfer the message
2 x Sentence number
3 x Sequential message identifier
4 a AIS channel
5 s—s Encapsulated ITU-R M.1371 radio message
6 x Number of fill-bits
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APPENDIX (B)
B.1 Monitoring of System Functions and Integrity
In case a failure is detected in one or more of the following functions or data, an alarm will be
triggered and displayed on the menu-tree under Alarm List, and the system (transponder) will
react as described in the following table.
Alarm's description text Alarm
ID
Reaction of the system
(transponder)
AIS: Tx malfunction 001 Stop transmission
AIS: Antenna VSWR exceeds limit 002 Continue operation
AIS: Rx channel 1 malfunction 003 Stop transmission on affected channel
AIS: Rx channel 2 malfunction 004 Stop transmission on affected channel
AIS: Rx channel 70 malfunction 005 Continue operation
AIS: general failure 006 Stop transmission
AIS: UTC sync invalid 007 Continue operation using indirect or
semaphore synchronisation
AIS: MKD connection lost 008 Continue operation
AIS: internal / external GNSS position
mismatch
009 Continue operation
AIS: NavStatus incorrect 010 Continue operation
Heading sensor offset 011 Continue operation
AIS: active AIS SART 014 Continue operation
AIS: external EPFS lost 025 Continue operation
AIS: no sensor position in use 026 Continue operation
AIS: no valid SOG information 029 Continue operation using default data
AIS: no valid COG information 030 Continue operation using default data
AIS: Heading lost/invalid 032 Continue operation using default data
AIS: no valid ROT information 035 Continue operation using default data
B.2 Antenna VSWR Exceeds Limit
There is a built-in RF output power detector, which is used to monitor the VSWR of VHF antenna
port. If the antenna VSWR exceeds limit, an alarm will be reported while the unit operates
continuously. The system will output an ALR 002 at related PI port.
B.3 Detection of Tx Malfunction
A built-in lock detector (high active) is used to monitor the local oscillator (PLL circuit) of the
transmitter. If the operation of PLL circuit becomes abnormal, a logic low (TX malfunction) will be
sent from the lock detector to notify the system. At the same time, system will also output an ALR
001 at the related PI port.
B.4
Detection of Rx Malfunction
The Smartfind M5 also has 3 built-in lock detectors (high active) to monitor each local oscillator
(PLL circuit) of receiver channel 1, channel 2, and channel 70 respectively. If the operation of PLL
circuit becomes abnormal, a logic low level will be sent from the lock detector to notify the system.
At the same time, the system will output ALR 003 or ALR 004 or ALR 005 at the related PI port to
indicate the CH1 or CH2 or CH70 RX malfunctions respectively.