Abbreviating Commands
The command syntax shows some characters in a mixture of upper & lower case. Abbreviating the command to only sending the upper case has the same meaning as sending the upper & lower case command.
For example, the command “SYSTem:COMMunicate:SERial:BAUD 2400” would set an RS-232 serial communications interface to 2400 bit/s. This could also alternatively be abbreviated “SYST:COMM:SER:BAUD 2400”. The query command “SYSTem:COMMunicate:SERial:BAUD?” or “SYST:COMM:SER:BAUD?” would instruct the instrument to report its current baud rate.
Read more about this topic: Standard Commands For Programmable Instruments
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