For baud rates up to and including 115.2 kbit/s, the RZI modulation scheme is used. “0” is represented by a light pulse of 3/16th of a bit time. Some examples of signal pulse duration are shown in the following table.
| Baud Rate | Pulse Duration (3/16) |
|---|---|
| 2.4 kbit/s | 78.13 μs |
| 9.6 kbit/s | 19.53 μs |
| 19.2 kbit/s | 9.77 μs |
| 38.4 kbit/s | 4.88 μs |
| 57.6 kbit/s | 3.26 μs |
| 115.2 kbit/s | 1.63 μs |
The following figure shows an example of character transmission.
Figure 1. IrDA Modulation
