AVOCOR AVF- 6500 Series, Installation & Operation Manual

Page: 64 / 84

64
Using Disc re te IR C o d e s
The d isp la y a c c e p ts c o mma nd s in the fo rm o f infra re d (IR) sig na ls tha t c o nfo rm to the NEC p ro to c o l. Ea c h d isp la y
re mo te c o ntro l b utto n ha s a n IR c o ntro l c o d e a sso c ia te d with it.
Yo u c a n use the se c o d e s to p ro g ra m a third -p a rty, “ unive rsa l” re mo te c o ntro l unit to wo rk with the d isp la y. The se
third -p a rty p ro d uc ts usua lly c o me with a c o mp ute r so ftwa re a p p lic a tio n fo r this p urp o se . Fo r mo re info rma tio n,
c o nsult the d o c ume nta tio n p ro vid e d with the re mo te c o ntro l unit.
IR C o m m a nd Pro to c o l
The IR c o ntro l c o d e s ha ve the fo llo wing c ha ra c te ristic s:
• Ea c h c o d e c o nsists o f the fo llo wing :
 A le a d e r p ulse (a mo d ula te d p ulse o f 9 ms fo llo w e d b y a no n-mo d ula te d p ulse o f 4.5 ms);
 16 a d d re ss b its (a lso c a lle d a “ c usto m c o d e ” ): e ig ht (8) b its fo r the a d d re ss fo llo w e d b y the lo g ic a l
inve rse o f the a d d re ss. The c usto m c o d e fo r the d isp la y is 16559 d e c ima l (0x40AF, b ina ry 01000000
10101111).

16 d a ta b its: e ig ht (8) b its fo r the c o m m a nd fo llo w e d b y the lo g ic a l inve rse o f the c o m m a nd ; a nd
 An e nd p ulse (a mo d ula te d p ulse o f 0.56 ms, simila r to the mo d ula te d p ulse in the ‘ 0’ a nd ‘ 1’ b its).
The e nd o f the mo d ula te d p ulse c o nstitute s the e nd o f the d a ta tra nsmissio n.
• The c a rrie r fre q ue nc y is 38 kHz, with the mo d ula te d p ulse s ha ving a 33% d uty c yc le .
• C o mm a nd s a re se nt a t a m a xim um ra te o f 9 Hz.
Fo r e xa m p le , he re is the NEC c o ntro l c o d e fo r the PO WER b utto n o n the d isp la y re mo te c o ntro l unit:
He x 4 0 A F 1 C E3
Bina ry 01000000 10101111 00011100 11100011
Func tio n C ust. C o d e Byte 1 C ust. C o d e Byte 2 C o mma nd
C o mma nd (Lo g ic a l
Inve rse )