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is a valid message that sets the acquisition mode to average, queries the

number of acquisitions for averaging, and then queries the acquisition state.

The instrument executes concatenated commands and queries in the order it

receives them.

■

Any query that returns arbitrary data, such as ID, must be the last query when

part of a concatenated command. If the query is not last, the instrument

generates event message 440.

Here are some INVALID concatenation examples:

■

CH1:COUPling DC;ACQuire:NUMAVg 16 (missing colon before ACQuire)

■

CH1:COUPling DC;:BANDwidth ON (invalid colon before BANDwidth)

■

CH1:COUPling DC;:*TRG (invalid colon before a star (*) command)

■

HORizontal:MAIn:POSition 0;MAIn:SCAle 1E-13 (levels of mnemonics are

different; either remove the second occurrence of MAIn:, or put HORizontal:

in front of MAIN:SCAle)

Message Terminators

This manual uses the term <EOM> (End of message) to represent a message

terminator.

GPIB End of Message (EOM) Terminators. GPIB EOM terminators can be the

END message (EOI asserted concurrently with the last data byte), the ASCII

code for line feed (LF) sent as the last data byte, or both. The instrument always

terminates messages with LF and EOI. White space is allowed before the

terminator; for example, CR LF is acceptable.

USB End of Message (EOM) Terminators. The EOM bit must be set in the USB

header of the last transfer of a command message

See the USB Test and Measurement Class Specification (USBTMC) section

3.2.1 for details. The instrument terminates messages by setting the EOM bit in

the USB header of the last transfer of a message to the host (USBTMC

Specification section 3.3.1), and by terminating messages with a LF. White

space is allowed before the terminator; for example, CR LF is acceptable.

Command Syntax

8 TBS2000 Series Programmer

Tektronix TBS2000 Series User Manual

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