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
l Lock requests can be nested; each request increases lock count by 1. For every request, you need a
release (SYSTem:LOCK:RELease) from the same I/O interface.
l Locks are handled at the I/O interface level (USB, LAN, etc.) and you are responsible for all coordin-
ation between threads and/or programs on that interface.
l When a request is granted, only I/O sessions from the present interface can change the instrument
state. You can only query the instrument state from other I/O interfaces.
l LAN sessions locks are automatically released when a LAN disconnect is detected.
l Granting a lock sets Bit 10 in the Standard Operation Register (STATus:OPERation:CONDition?). In
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 Truevolt Series Operating and Service Guide
421
SCPI Programming Reference
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