Airmar NMEA 2000® Depth, Датчики - Manual (Page 11)

DST200 User Manual revision 1.000
Proprietary and Confidential
9
This PGN does not respond to ISO Requests (PGN 59904).
When this PGN is transmitted, field 5 provides the current Access Level of the DST, and field 7 provides a randomly-generated Seed that may be used in a subsequent Unlock
operation.
To change the Access Level, use the Command Group Function PGN 126208, specifying the individual fields in PGN 65287 as follows:
To change the Access Level to 0 (i.e. to lock the device after having been previously unlocked):
Use the Command Group Function PGN 126208, specifying the individual fields in PGN 65287 as follows. (Note that it is not required to specify field 7.)
PGN 65287
Field Value
1 135 (decimal)
3 4 (decimal)
4 1
5 0
The DST will respond with the Acknowledge Group Function PGN 126208, indicating success or failure according to the error codes provided in the parameter
fields.
To change the Access Level to 1:
Use the Command Group Function PGN 126208, specifying the individual fields in PGN 65287 as follows.
Field 7 serves as a simple password to allow setting the Access Level to 1. For this Access Level, it is not necessary to obtain a Seed or calculate a Key.
PGN 65287
Field Value
1 135 (decimal)
3 4 (decimal)
4 1
5 1
7 0x12345678
The DST will respond with the Acknowledge Group Function PGN 126208, indicating success or failure according to the error codes provided in the parameter
fields.
To change the Access Level to 2 or higher:
1. Use the Request Group Function PGN 126208, specifying PGN 65287, to obtain a Seed.
2. The DST will respond with PGN 65287, with the current Access Level in field 5, and with a random Seed in field 7.
3. Using the Seed provided in step 2, calculate a Key according to the algorithm corresponding to the desired Access Level.
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