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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.
If the byte 10 hex is part of the data, this byte is sent twice so that it is
not confused with DLE ETX (10 hex), which ends the data phase.
Receive Address Phase
To acquire data from the television demodulator, the PC first sends the
Ad and Arr addresses to identify the television demodulator. This
address phase aborts other communication on the same bus. The
television demodulator responds with a not ready phase if it does not
have the requested data. It responds with a ready phase followed by a
data phase when it has data. The receive data phase contains the Ad
and Arr addresses to identify the responding television demodulator.
Examples of receive communication between the PC and the
television demodulator follows with descriptions in italics.
The PC addresses a television demodulator that has no data available:
PC > [DLE] [ENQ] [Ad] [Arr]
DS1000 > [DLE] [WACK]
The PC addresses a television demodulator that has data available, and
the television demodulator returns the data:
PC > [DLE] [ENQ] [Ad] [Arr]
DS1000 > [DLE][STX][Ad][Arr][Data][DLE][ETX]
DS1000 Series User Manual
Appendix B: Remote Control
Ready response
Data phase
Addressing phase
Aborted ready response
Data phase
Addressing phase
Not Ready response
Addressing phase
Ready response and data phase
B–7
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