4 System
4.2 I/O Config
NOTE
Remote I/O interfaces are grouped in two types: single-session interface and
multi-session interface. Both types of interfaces can be used for cooperative
instrument sharing.
The recommended interface is LAN HiSLIP.
Interface Single-session Multi-Session
GPIB ü
USB-488 ü
LAN VXI-11
(SICL)
ü
LAN Socket ü
LAN HiSLIP ü
LAN Telnet ü
If using a single-session interface, care must be taken to ensure only one client uses
the single-session interface.
In particular, LAN VXI-11 (SICL) interface is a single-session interface, even though
multiple clients could simultaneously connect to this interface. Such multiple VXI-
11 clients share the same session context; the same status registers and the same
error queue. Even a SCPI query response can be received by another client.
Furthermore, the lock obtained by :SYSTem:LOCK:REQuest? is shared among all
VXI-11 clients, allowing all of them to actively control the instrument.
If a LAN VXI-11 (SICL) interface must be used by multiple clients for a cooperative
instrument sharing, then VISA locking must be used, in addition to Remote I/O
Session Lock.
4.2.10.1 Lock Remote I/O Request (Remote Query only)
You can lock the SCPI control of the instrument to the I/O Interface and Session by
sending :SYSTem:LOCK:REQuest?. This permits cooperative sharing of the
instrument between multiple computers, or multiple sessions from the same
computer.
Remote
Command
:SYSTem:LOCK:REQuest?
Example
:SYST:LOCK:REQ?
Notes Returns 1 if the lock request is granted, or 0 if the request is denied
Lock requests on an individual interface and session can be nested and each request will increase an
internal lock count by 1. For every granted request, send :SYST:LOCK:REL to decrement the
internal lock count to fully relinquish the lock
When the instrument is locked, Bit 0 is set in the Operation Instrument status register
Short Range Comms & IoT Mode User's &Programmer's Reference 1764
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