A command-string to be sent to an instrument on the GPIB bus.

Input Format:

A string of up to 80 characters.

Context:

Most expensive measuring instruments such as oscilloscopes and power meters can be controlled and monitored under computer control via a GPIB bus. To control an instrument one sends it a command string. This can be done with the gpib_send(), which requires the command string to be sent as a GpibCmd value.