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Components and Operation
English, Revision 06, Date: 14.12.2016
19
*)
As soon as the transponder leaves the antenna field these bits
are deleted
**)
This bit is deleted when the transponder leaves the antenna field
or after a chosen time (refer to 5.2.2.2 on page 30)
Errors
0x0002
and
0x0004
may also arise during ordinary transponder crossings, if
the code transmission is aborted due to decreasing power output level. The message
0x0100 (REF_TRANS_ON) enables checking whether transmission of the correspond-
ing switch-off command has been forgotten (in this case, it is no longer possible to
read runway transponders correctly).
4.2.4.1.2
List of System Commands
One command telegram always consists of four bytes, including the actual command
and the parameters. When using the procedure transparent it is, in addition, neces-
sary to transfer one start character and a check sum (XOR operation of all bytes in-
cluding the start character).
There are three commands:
0x1000
POSIPULS
transponder crossed center of the antenna **)
0x2000
0x4000
0x8000
No.
Meaning
Procedure
Start sign
command
byte
parameter
Check
sum
1
Switch to monitor mode
(described in 5.2 on
page 27)
3964R
HEX
4D
16
49
16
4E
16
49
16
ASCII
MO
NI
trans-
parent
HEX
3D
16
4D
16
4F
16
4E
16
49
16
38
16
ASCII
=
MO
NI
8
2
deactivate reference
transponder
3964R
HEX
52
16
54
16
30
16
30
16
ASCII
RT
00
trans-
parent
HEX
3D
16
52
16
54
16
30
16
30
16
3B
16
ASCII
=
RT
00
;
Table 7
List of system commands
Valency
Name
Description
Table 6
Possible system status / error messages (Section 2 of 2)