Section 2: General operation
Model 2651A High Power System SourceMeter® Instrument Reference Manual
2-76
2651A-901-01 Rev. A / March 2011
Raw socket:
Raw socket is a basic Ethernet connection that communicates similarly to RS-232
without explicit message boundaries. The instrument will always terminate messages with a line feed,
but because binary data may include bytes that resemble line feed characters, it may be difficult to
distinguish between data and line feed characters.
VXI-11:
VXI-11 is similar to GPIB and supports message boundaries as well as service requests
(SRQs). A VXI-11 driver or VISA software is required. Test Script Builder (TSB) uses VISA and can
be used with the VXI-11 interface.
Telnet:
Telnet is similar to raw socket and is used when the user needs to interact directly with the
instrument, typically for debugging and troubleshooting. Telnet requires a separate telnet program.
Dead socket termination port:
The dead socket termination port is used to terminate all existing
LAN connections. A dead socket is one which is held open by the instrument because it has not been
properly closed. This most often happens when the computer is turned off or reboots without first
closing the socket. This port cannot be used for command and control functions.
Monitoring the LAN:
The
lan.autoconnect
command configures the instrument to monitor the
LAN for lost connections. All Ethernet connections are disconnected if the LAN link is disconnected
for longer than the time-out value specified in the
lan.linktimeout
attribute.
GPIB operation
This topic contains information about GPIB standards, bus connections, and primary address
selection.
GPIB standards
The GPIB is the IEEE-488 instrumentation data bus with hardware and programming standards
originally adopted by the IEEE (Institute of Electrical and Electronic Engineers) in 1975. The
instrument is IEEE Std 488.1 compliant and supports IEEE Std 488.2 common commands and status
model topology.
Connect the GPIB cable
To connect a to the GPIB bus, use a cable equipped with standard IEEE-488 connectors, as shown
below.
