· Error: The IC¢s power source is activated by pins AD8~AD11

Flowchart

· HT12A

· HT12E

Note: D8~D11 are transmission enables of the HT12A.

TE is the transmission enable of the HT12E.

HT12A/HT12E

HT 1 2 E

OS C 2

OS C 1

VS S

TE

VD D

12V

AD 1 1

AD 1 0

AD 9

AD 8

S t andby m ode

D a t a enabl e?

No

No

D a t a w it h c a r r ie r

s e r i a l out put

D a t a s t i l l enabl ed ?

L/ M B = G N D ?

S end t h e

l a s t c o d e

No

Ye s

Ye s

Ye s

S end ² 1 ² 7 t i m e s fo r

al l of t he da t a c odes

Po w e r o n

S t andby m ode

T r ans m i s s i on

enab l e d ?

No

No

Ye s

Ye s

4 da t a w or ds

t r ans m i t t ed

T r ans m i s s i on

s t ill enabl ed

4 da t a w or ds

t r ans m i t t ed

c ont i n u ous l y

Po w e r o n