Appendix E 4 0 0 W S E R I E S R S - 2 3 2 F U E L / A I R D A T A I N P U T F O R M A T; L E C T R I C A L I N T E R F A C E; H A D I N A L T I T U D E S E N T E N C E; C A R U S A L T I T U D E S E N T E N C E - Garmin GPS 400W Installation Manual

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A p p e n d i x E 4 0 0 W S E R I E S R S - 2 3 2 F U E L / A I R D A T A I N P U T F O R M A T
E . 1 E l e c t r i c a l I n t e r f a c e
T h e i n p u t s i g n a l s a r e c o m p a t i b l e w i t h R S - 2 3 2 C . D a t a i n p u t i s a t 9 6 0 0 b a u d w i t h a w o r d l e n g t h o f 8 b i t s ,
o n e s t o p b i t , a n d n o p a r i t y . O n e m e s s a g e i s r e c e i v e d p e r s e c o n d .
E . 2 S h a d i n A l t i t u d e S e n t e n c e
T h e G a r m i n 4 0 0 W S e r i e s u n i t s a r e c a p a b l e o f r e c e i v i n g t h e f o l l o w i n g 1 7 - b y t e m e s s a g e f r o m S h a d i n
A l t i t u d e E n c o d e r s , A l t i t u d e S e r i a l i z e r s , a n d A l t i t u d e C o n v e r t e r s :
W h e r e :
R M S A S C I I c h a r a c t e r s
< s p > s p a c e ( 0 x 2 0 )
< + / - > s i g n i n d i c a t o r ( 0 x 2 b [ " + " ] o r 0 x 2 d [ " - " ] )
1 2 3 4 5 a l t i t u d e i n f e e t
T
A S C I I c h a r a c t e r
< + / - > s i g n i n d i c a t o r
1 2
s e n s o r t e m p e r a t u r e
u l
c h e c k s u m o f b y t e s 1 t h r o u g h 1 4 i n h e x A S C I I ( i . e . , " F A " )
< C R > c a r r i a g e r e t u r n ( 0 x 0 d )
N o t e :
C h e c k s u m i s c a l c u l a t e d b y a d d i n g e a c h b y t e i n t h e m e s s a g e ( 1 t h r o u g h 1 4 ) .
E . 3 I c a r u s A l t i t u d e S e n t e n c e
T h e G a r m i n 4 0 0 W S e r i e s u n i t s a r e c a p a b l e o f r e c e i v i n g t h e f o l l o w i n g 1 0 - b y t e m e s s a g e f r o m t h e I c a r u s
A l t i t u d e S e r i a l i z e r :
A L T < s p > 1 2 3 4 5 < C R >
W h e r e :
A L T A S C I I c h a r a c t e r s
< s p > s p a c e ( 0 x 2 0 )
1 2 3 4 5 a l t i t u d e i n f e e t
< C R > c a r r i a g e r e t u r n ( 0 x 0 d )
4 0 0 W S e r i e s I n s t a l l a t i o n M a n u a l
1 9 0 - 0 0 3 5 6 - 0 2
R M S < s p > < + / - > 1 2 3 4 5 T < + / - > 1 2 u l < C R >
P a g e E - 1
R e v . A

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