Acars Messages

[acarslogger]

Using vdlm2dec, I'm receiving acars messages similar to ...

[#5 (F:136.975 P:-5.2) 01/02/2018 06:35:57.089 --------------------------------
Command from Aircraft:4B17E5 (airborne) to GroundD:10902A 
Frame-I: Ns:5 Nr:4
ACARS
Aircraft reg: HB-JBH Flight id: LX0450
Mode: 2 Msg. label: H1
Block id: 7 Ack: !
Msg. no: 701A
Message :
#T7B- R001
ACARS Header
 HB-JBH,5318410-02,649537,200637,01631,LSZH,EGLC,06:13:14,2018:02:01,00000000
000010,152000
    0.76 (06:21:35)
0.000,0.000,0.000,0.000,03b15,03aa5,00001,0.312,0.000,21.984,22.727,00001

Block End

and ...

[#5 (F:136.975 P:-5.2) 01/02/2018 06:36:14.522 --------------------------------
Command from Aircraft:4B17E5 (airborne) to GroundD:10902A 
Frame-I: Ns:1 Nr:0
ACARS
Aircraft reg: HB-JBH Flight id: LX0450
Mode: 2 Msg. label: H1
Block id: 1 Ack: !
Msg. no: 701E
Message :
#T7B99.625,98.578,159.688,70.375,2.844,2.250,535.562,530.812,124.953,130.031
101.781,97.516,99.750,102.250,-113.000,-54.000,88.250,88.250,1800.000,1869.500
397.500,386.500,1674.000
ACARS Footer:  

I assume that the text 'ACARS' defines the start of an acars message, but what are 'ACARS Header' and 'ACARS Footer'? Are they part of the actual aircraft acars message or debug information? Can they be removed?

Likewise there are number of messages that end with a 'Block End' text. Is this part of the acars message or debug info?

Stuart

[TLeconte]

Yes ACARS defines the start of an ACARS message Block End is part of acars message ( special character 0x17). Don't known about ACARS Header/Footer , there is not such things in my sources ??? Perhaps there are just part of your received message ...

[acarslogger]

Apologies. I hadn't noticed the Acars Header/Footer before. It appears in the last couple of weeks that Swiss have implement new acars software which now includes this text.