Telnet connection
The Telnet protocol is similar to raw socket and can be used when you need to interact directly with
the instrument. Telnet is often used for debugging and troubleshooting. You need a separate Telnet
program to use this protocol.
The 2601B-PULSE supports the Telnet protocol, which you can use over a TCP/IP connection to
send commands to the instrument. You can use a Telnet connection to interact with scripts or send
real-time commands.
VXI-11 connection
This remote interface is similar to GPIB and supports message boundaries, serial poll, and service
requests (SRQs). A VXI-11 driver or NI-VISA software is required. Test Script Builder (TSB) uses
NI-VISA and can be used with the VXI-11 interface. You can expect a slower connection with
this protocol.
Raw socket connection
All Keithley instruments that have LAN connections support raw socket communication. This means
that you can connect to the TCP/IP port on the instrument and send and receive commands. A
programmer can easily communicate with the instrument using the Winsock API on computers with
the Microsoft
®
Windows
®
operating system or using the Berkeley Sockets API on Linux
®
or
Apple
®
computers.
Raw socket is a basic ethernet connection that communicates in a manner similar to RS-232 without
explicit message boundaries. The instrument always terminates 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.
Use raw socket as an alternative to VXI-11. Raw socket offers a faster connection than VXI-11.
However, raw socket does not support explicit message boundaries, serial poll, and service requests.
Dead socket connection
The dead socket termination (DST) port is used to terminate all existing ethernet connections. A dead
socket is a socket that is held open by the instrument because it has not been properly closed. This
most often happens when the host computer is turned off or restarted without first closing the socket.
This port cannot be used for command and control functions.
Use the dead socket termination port to manually disconnect a dead session on any open socket. All
existing ethernet connections are terminated and closed when the connection to the dead socket
termination port is closed.
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