User`s guide

Example
The following command decreases the lock count by one.
SYST:LOCK:REL
The following series of commands illustrates usage.
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
Note that for each successful lock request, a lock release is required. Two
requests require two releases.