192 Keysight E8402A, E8404A C-Size Mainframes User and Service GuideProgramming the Enhanced Monitor SYSTem SubsystemSYSTem:POWer <state>SYSTem:POWer?SYSTem:POWer sets the software controlled power-on/off state ofmainframe.SYSTem:POWer? returns a string representing the power state of the mainframe.ParametersReturned DataComments– The mainframe can be turned on with this command at any time, evenwhen mainframe power is already on. Once set ON with this command, aSYSTem:POW OFF must be sent before the mainframe can actually turnoff. The mainframe will not turn off unless the main power switch is onSTDBY and the Diagnostic Connector power pin (pin 5) is unasserted (notgrounded, refer to “Using the Remote Power-On Pins” on page 24).Error ConditionsThe following table lists the most common error conditions and causes. Errornumbers and corresponding messages can be found using SYSTem:ERRor?query.Reset Condition*RST has no effect on powering of the mainframe.Name Type Range Default Description<state> Boolean ON, OFF,0, 11 Sets the software control state of themainframe. 0 is OFF, 1 is ON.Type Range DescriptionBoolean 0, 1 Software control state for mainframe power. 0 is OFF, 1 is ON.Number Message Probable Cause-224 “Illegal Parameter” The parameter was not correct.-109 “Missing Parameter” The parameter was omitted.-221 “Settings Conflict” The mainframe cannot turn off by software controlbecause the main power switch is on, or theDiagnostic Connector’s power pin is being driven.
