Command Types; Sending And Receiving Data; Send Address Phase - Tektronix DS1000 Series User Manual

Command Types

There are two types of commands.
H Select commands end with an equal sign (=), such as "PRESET=".
Select commands set the television demodulator to operate in any
mode allowed from the front panel.
H Query commands end with a question mark (?), such as "PRE-
SET?". Query commands tell the television demodulator to
prepare to send a particular type of data to the PC.
Commands may be followed by one or more parameters specific to the
command. Parameters are in binary format. Query commands often do
not require parameters. The response data from a query command may
contain several parameters.
For information on the syntax used for command definitions, refer to
page B–11. The alphabetical list of commands and their parameters
begins on page B–13.

Sending and Receiving Data

The PC must send commands and addresses in a certain order when
writing data to and reading data from the television demodulator. The
main steps in the communications process are as follows:
1. Send the identifying addresses.
2. Detect readiness of the television demodulator.
3. Send command and parameters.
4. Receive response/data.
Several types of communications are possible. Each type has a pattern
of commands or phases that must be used. The following discussions
introduce these communication phases: send address, send data,
receive address, poll for messages, and get messages.

Send Address Phase

The PC uses Ad and Ars to address a particular television demodula-
tor. The television demodulator configured with a matching address
answers with either a ready response or a not ready response. Sending
DS1000 Series User Manual
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Appendix B: Remote Control
B–5