IEC PAS 61162-103 pdf – Maritime navigation and radiocommunication equipment and systems – Digital interfaces – Part 103: Single talker and multiple listeners – New and amended sentences and Talker IDs
2.2.2EPL- Command or report long equipment property value
The EPL sentence provides a method to command and report specific equipment settings when
the “Value of property to be set” is longer than possible using a single EPL sentence. Thissentence is a command sentence.
This sentence shall not be queried.A query for EPL sentence may result in the generation ofone or more EPL messages or EPL sentences as necessary to report all configurable equipmentproperties and their current values.
When this sentence is sent as a command and not accepted,the receiving equipment shallgenerate a NAK sentence response providing an appropriate “reason code”.
Comments:
1)The first field specifies the total number of sentences used for a message,minimum value 1. The second field
identifies the order of this sentence in the message，minimum value 1. These fields are integer fields with nodecimal point or decimal digits. These cannot be null fields.
2)The sequential message identifier relates all sentences that belong to a group of multiple sentences (i.e.
message). Multiple sentences (see Comment 1) with the same sequentialmessage identifier，make up onemessage. This field is an integer field with no decimal point or decimal digits.
3)This field is used to indicate a sentence that is a status report of current settings or a configuration command
changing settings.This field shall not be null.
R = Sentence is a status report of current settings (use for a reply to a query).
= Sentence is a configuration command to change settings. A sentence without “C” is not a command.
4) The equipment field contains the two character talker lD of the destination equipment when this sentence is sent
as a command as designated by the “Sentence status flag”field,and identifies the device type for which thesentence is targeted.When this sentence is a report(e.g. in response to a query) as designated by the “Sentencestatus flag”field, the equipment type field contains the talker ID of the equipment generating the ‘sentence.
5)
The unique identifier identifies the same equipment irrespective of command versus response: For commands itidentifies the equipment intended to receive the command.For responses it identifies the equipment that actuallyreceived the command. Under normal conditions the response will be received from the equipment for which thecommand was intended. Equipment should only send one or more response sentences in ‘response to commandsentences received and should not use response sentences for general reporting.The unique identfier may benull.
6)The property identifier is a variable length integer field that identifies a parameter that can be set as defined in
an applicable equipment standard and is intended for commissioning settings.
7) The “Value of property to be set” is a variable length character string representing the intended configuration
parameter value when the sentence is a command and the current value when the sentence is a report. Characterstrings are concatenated to form a single long character string as the Value of the property to be set. Thecharacter string may contain both valid characters, see Table 2 of IlEC 61162-1:2016, and reserved characters,see Table 1 of IEC 61162-1:2016. Reserved characters shall be represented using the n method (see 7.1.4 ofIEC 61162-1:2016).
Examples of EPM sentence command and response:
The example shows an ECDlS (with a Talker lD of “El) setting a configuation paprameter 1234 of an AIStransponder (with a Talker ID of “A””) for a long parameter value of “This-is-an-example-of-a-long-parameterwhich-continues-over-multiple-messages”. In this example,the unique identfier is the value of the MMSI of theAlS “503123450” and the Sequental message identifier is 98. The ECDlS would send the following command:$EIEPM,02,01,98,C,AlI,503123450,1234,This-is-an-example-of-a-long-parameter*53
$EIEPM,02,02,98,C,Al,503123450,1234,-which-continues-over-multiple-messages*09For a query from ECDIs to AIS
SEIAIQ,EPV*hh
The AlS would send the following response (in this example the Sequental message identifier is 25);$EIEPM,02,01,25,R,A,503123450,1234,This-is-an-example-of-a-long-parameter-wh*76
$EIEPM,02,02,25,R,Al.,503123450,1234,ich-continues-over-multiple-messages*2C