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Appendix B: Remote Control
this address data aborts all other communication on the bus. The
following three cases show variations of the send address phase.
The PC addresses a television demodulator that is not ready to receive
data:
PC > [DLE] [ENQ] [Ad] [Ars]
DS1000 > [DLE] [WACK]
The PC addresses a television demodulator that is ready, and the PC
sends data:
PC > [DLE] [ENQ] [Ad] [Ars]
DS1000 > [DLE] [ACKO] [Ad] [Ars]
PC > [DLE] [STX] [Data] [DLE] [ETX]
The PC addresses a television demodulator that is not ready, ignores
the not ready response, and sends data:
PC > [DLE] [ENQ] [Ad] [Ars]
DS1000 > [DLE]
PC > [DLE] [STX] [Data] [DLE] [ETX]
The PC can ignore the not-ready response and transmit the addressing
phase and data phase sequentially. In this case, the television
demodulator aborts the not ready response after receiving the first byte
of the data phase. The PC receives only a DLE character.
When sending data, Ad and Ars can be replaced by FF hex, a
broadcast address. When the television demodulator sends a ready
response, it will send its real address. You can use this broadcast
address to determine the address of a television demodulator. The wild
card remote address is always a send address phase.
Send Data Phase
The send data phase begins with a command and may be followed by
one or more parameters specific to the command. Two techniques for
sending data are possible.
The PC addresses a television demodulator that is ready and sends
data:
PC > [DLE] [ENQ] [Ad] [Ars]
B–6
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Addressing phase
Not ready response
Addressing phase
Ready response
Data phase
Addressing phase
Aborted ready response
Data phase
Addressing phase
DS1000 Series User Manual
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