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Application acknowledgement to an addressed message

Introduction/Additional information: 

When requested, this VDE Protocol Format may be used by an application to confirm the reception and processing of a VDES addressed specific application message. An application should never acknowledge a broadcast message. Manual acknowledgement by human interaction is not covered by this mechanism.

If the interrogating application does not receive this acknowledgment reply, even though it was requested, then the application should assume that addressed VDE protocol format is not handled by the interrogated station.

The interrogated protocol format handling application shall respond with this message within 1 second after receiving the addressed interrogation message.

Permitted as from: 
01/12/2022
Registrant: 
IALA
Physical link: 
VDE-TER
Message number (0=VDES-VDE): 
0
DAC or VPFI: 
2
FI / Message ID: 
3
Technical point of contact: 

IALA

G1117-Ed3.0-VHF-Data-Exchange-System-VDES-Overview

State: 
proposal
Number of slots (max): 
1
FEC: 
No
Last modified: 
29/03/2023 - 15:09
Details: 

Parameter

Number of bits

Description

VPFI

16

2

Message ID

16

3

Received Message ID

16

As received

Sequence number

2

0-3; see ITU-R M.1371-5 ยง 5.3.1, Annex 2

Text sequence number

11

Sequence number in the message being acknowledged as properly received

0 = default (no sequence number)

1-2 047 = sequence number of received VFM

Message ID available

1
  1. = received but Message ID not available
  2. = Message ID available

Spare bits

2

Not used, should be set to zero, reserved for future use 

Total number of bits

64