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O P E R A T I O N M A N U A L
A T C - 6 0 1
APPEN D I X B
P a g e 1 4
J u n 1 / 9 7
F I E L D
S U B
F I E L D
N O . O F
B I T S
B I T S
P O S I T I O N
F O R M A T S
U P D O W N
C O N T E N T
S D
1 6
1 7 - 3 2
X
C o n t a i n s c o n t r o l c o d e s , a s s p e c i f i e d b y t h e
D I f i e l d a f f e c t i n g t r a n s p o n d e r p r o t o c o l a n d
i s p a r t o f s u r v e i l l a n c e a n d C o m m - A
i n t e r r o g a t i o n s U F = 4 , 5 , 2 0 , 2 1 .
I I S
4
1 7 - 2 0
X
I n t e r r o g a t o r I d e n t i f i e r s u b f i e l d c o n t a i n s t h e
s e l f - i d e n t i f i c a t i o n c o d e o f t h e i n t e r r o g a t o r
a n d i s n u m e r i c a l l y i d e n t i c a l t o t h e I I c o d e
t r a n s m i t t e d b y t h e i n t e r r o g a t o r i n M o d e S
O n l y A l l C a l l s . I I S c o d e s a r e 0 t h r o u g h 1 5 ;
I I S = 0 i s n o t a v a l i d i n t e r r o g a t o r i d e n t i f i e r f o r
m u l t i s i t e p u r p o s e s . I I S i s s e n t o n l y w h e n
D I = 0 , 1 o r 7 .
L OS
1
2 6
X
L o c k o u t s u b f i e l d , i f s e t t o O n e , i n i t i a t e s a
m u l t i s i t e A l l C a l l l o c k o u t t o M o d e S O n l y A l l
C a l l s ( U F = 1 1 ) f r o m t h e I n t e r r o g a t o r
i n d i c a t e d i n I I S o f t h e i n t e r r o g a t i o n . I f L O S
i s s e t t o Z e r o , n o c h a n g e i n l o c k o u t s t a t e i s
c o m m a n d e d . L O S i s s e n t o n l y i f D I = 1 o r 7 .
MB S
2
2 1 - 2 2
X
M u l t i s i t e C o m m - B s u b f i e l d , s e n t w h e n D I = 1 ,
i s a s s i g n e d t h e f o l l o w i n g c o d e s :
0 = N o C o m m - B a c t i o n .
1 = C o m m - B r e s e r v a t i o n .
2 = C o m m - B c l o s e o u t .
ME S
3
2 3 - 2 5
X
M u l t i s i t e E L M s u b f i e l d , s e n t w h e n D I = 1 ,
c o n t a i n s r e s e r v a t i o n a n d c l o s e o u t
c o m m a n d s f o r E L M a s f o l l o w s :
0 = N o E L M a c t i o n .
1 = C o m m - C r e s e r v a t i o n .
2 = C o m m - C c l o s e o u t .
3 = C o m m - D r e s e r v a t i o n .
4 = C o m m - D c l o s e o u t .
5 = C o m m - C r e s e r v a t i o n a n d C o m m - D
c l o s e o u t .
6 = C o m m - C c l o s e o u t a n d C o m m - D
r e s e r v a t i o n .
7 = C o m m - C a n d C o m m - D c l o s e o u t s .
RRS
4
2 1 - 2 4
X
R e p l y R e q u e s t s u b f i e l d , s e n t w h e n D I = 7 ,
c o n t a i n s c o d i n g c o r r e s p o n d i n g t o t h e
r e q u e s t e d B D S 2 c o d e .
RS S
2
2 7 - 2 8
X
Re se r va t i o n S t a t u s su b f i e l d , se n t wh e n DI = 1 ,
r e q u e s t s t r a n s p o n d e r t o r e p o r t r e s e r v a t i o n
s t a t u s i n t h e U M f i e l d . T h e c o d e s a r e :
0 = N o r e q u e s t .
1 = R e p o r t C o m m - B r e s e r v a t i o n s t a t u s .
2 = R e p o r t C o m m - C r e s e r v a t i o n s t a t u s .
3 = R e p o r t C o m m - D r e s e r v a t i o n s t a t u s .
O ve r v i e w o f F o r m a t D e f i n i t i o n s
T a b l e 3 ( C o n t )
Summary of Contents for ATC-601-2
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