Chief Manufacturing CM2 - Manual (Page 17)

Installation Instructions CM2
17
NEC Protocol:
The modulated carrier is usually derived from 455kHz and is
1/12 of the frequency with 1/3 duty cycle.
When data are transmitted repeatedly, the frame cycle is
107.9ms or 186 period.
A frame consists of a syn pulse, an eight-bit custom code, an
eight-bit inverted custom code, an eight-bit data code and an
eight-bit inverted data code.
The timing definitions of the output code waveform are shown
below.
Table 1-1: IR System Code
Switch # 1 Switch # 2 Switch # 3 Custom Code
Off Off Off 6E
On Off Off E1
Off On
Off E2
On On Off E3
Off Off On E4
On Off On E5
Off On On E6
On On On E7
IR code is selected by Dipswitch settings, dipswitches are
located next to power inlet.
Figure 30