Townshend Computer Tools DAT-Link - Editing the Remote Control Descriptions

128 File Formats
stop
314 61 89 61 89 62 89 62 164 62 164 62 164 62 89 62 164
62 89 62 89 62 89 62 164 3139 -1
pause
314 62 163 62 88 62 88 62 164 62 163 62 163 62 88 62 163
62 88 62 88 62 88 62 163 3064 -1
play
314 62 88 62 164 62 88 62 88 62 163 62 164 62 88 62 163
62 88 62 88 62 88 62 163 3139 -1
The rst line of the le contains information that pertains to the device itself for
all remote control functions. The vevalues on the rst line are:
1. The name of the device.
2. The o-time of the carrier signal used with the infrared transmitter, in mi-
croseconds.
3. The on-time of the carrier signal used with the infrared transmitter, in mi-
croseconds.
4. The numb er of rep etitions of a sequence that should be transmitted to send
a command.
5. The p olarity of the transmissions, normally 1. A setting of -1 species that
the infrared transmitter is normally on, and should be pulsed o to send a
signal.
For this example, the 100 us on-time and 100 us o-time indicate that the carrier
frequency is 40 kHz with a 50% duty cycle and that a remote sequence should be
repeated transmitted 5 times for each command.
The rest of the le provides the modulation description for each command. Each
entry consists of the command name followed by a sequence of on and o times
followed by \-1". The on and o times are in units of 125 microseconds.
B.5.2 Editing the Remote Control Descriptions
One limitation of the DAT-Link 's remote control system is that is not able to
determine the carrier frequency of the remote control during training. It always
assumes that this is 40 kHz with 50% mo dulation. For most remote controls, this
is usually adequate. However, some remote systems require carrier frequencies of
32 kHz, while others may use frequencies up to 50 kHz. Even at these extremes, a
40 kHz signal usually still works, though its range may be limited. If one suspects
that a p o or remote link is due to a bad carrier frequency match, the carrier on-time
and o-time can b e manually edited in the description le to improve the situation.