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USB address:
Addressing string format: USB::<vendor ID>::<product ID>::<serial number>[::INSTR]
Where,
<vendor ID> ID of vendor;
<product ID> ID of instrument;
<serial number> Serial number of instrument.
Example:
USB::0x0AAD::0x00C6::100001::INSTR
0x0AAD: ID of vendor; 0xC6: ID of instrument;
100001: Serial number of instrument.
5.1.2 Message
Messages transmitted by data cable fall into the following two categories:
1) Interface message
The interface message is specific to the GPIB bus. Only the instrument with the GPIB bus function can respond to the
interface message. When the main control computer sends an interface message to the instrument, the attention line
should be pulled down at first, and then the interface message can be transmitted to the instrument through the USB
cable.
2) Device message
For the structure and syntax of device message, refer to Section "6.1.3 SCPI". Device message can be divided into
command and instrument response according to the different transmission directions. All remote control interfaces use
device message in the same method unless otherwise stated.
a. Commands:
A command (program message) is a message transmitted from the main control computer to the instrument for remote
control of instrument functions and query of status information. It falls into the following two categories:
Based on the impact on the instrument:
Setting command: Change the instrument setting status, e.g. reset the instrument or set the frequency.
Query command: Query and return the data, e.g. identify the instrument or query the parameter values. The query
command is always ended with a question mark.
Based on the definition in the standard:
Common command: Function and syntax defined by IEEE 488.2, which is applicable to all types of instruments (if
implemented) for standard status register management, resetting, self-test, etc.
