Keysight Truevolt Series Operating And Service Manual page 420

SYSTem:LOCK:REQuest?
Requests a lock of the current I/O interface. This allows you to lock the instrument's configuration or
cooperatively share the instrument with other computers.
Parameter Typical Return
(none) +0 (denied) or +1 (granted)
See Interface Locking Example
Lock requests can be nested; each request increases lock count by 1. For every request, you need a
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release (SYSTem:LOCK:RELease) from the same I/O interface.
Locks are handled at the I/O interface level (USB, LAN, etc.) and you are responsible for all coordin-
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ation between threads and/or programs on that interface.
When a request is granted, only I/O sessions from the present interface can change the instrument
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state. You can only query the instrument state from other I/O interfaces.
LAN sessions locks are automatically released when a LAN disconnect is detected.
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Granting a lock sets Bit 10 in the Standard Operation Register (STATus:OPERation:CONDition?). In
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addition, the entire instrument front panel, including the Local key, is locked out while a lock is in
place ("Front panel locked." is displayed).
Keysight True volt Series Operating and Service Guide
SCPI Programming Reference
421