Keysight 34461A - System Subsystem LOCK Commands

SYSTem Subsystem LOCK Commands
This subsystem locks and releases instrument I/O interfaces, as shown in the following example:
Initial State = unlocked, Count = 0
(FROM USB) SYST:LOCK:REQ? returns "1" (request successful)
State = locked, Count = 1
(FROM GPIB) SYST:LOCK:REQ? returns "0" because USB has lock
State = locked, Count = 1
(FROM USB) SYST:LOCK:REQ? returns "1" (request successful)
State = locked, Count = 2
(FROM USB) SYST:LOCK:REL
State = locked, Count = 1
(FROM USB) SYST:LOCK:REL
State = unlocked, Count = 0
For each successful lock request, a lock release is required. Two requests require two releases.
Command Summary
SYSTem:LOCK:NAME?
SYSTem:LOCK:OWNer?
SYSTem:LOCK:RELease
SYSTem:LOCK:REQuest?
Keysight Truevolt Series Operating and Service Guide
419
SCPI Programming Reference