System Commands 
  Copyright © Itech Electronic Co., Ltd.  48 
SYSTem:RWLock 
This command is used to set AC load to remote control mode via RS232 
communication interface. And Local button is not available. After this command 
is executed, set the mode of AC load to remote.control mode. But unlike 
SYST:REM command, all the keys on the front panel including Local key will be 
locked.   
Command syntax: 
SYSTem:RWLock 
Parameter: 
None 
Returned value: 
None 
SYSTem:BACKlight:BRIGhtness   
This command is used to set the brightness of backlight. 
Command syntax: 
SYSTem:BACKlight:BRIGhtness <NR1> 
Parameter: 
NR1 
Parameter range: 
1 to 9 
Query Syntax: 
SYSTem:BACKlight:BRIGhtness? 
Returned value: 
<NR1>