Raw Socket Connection; Dead Socket Connection; Telnet Connection - Keithley 2601B Reference Manual

Appendix C: LAN concepts and settings

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 Winsock on Windows computers or
Berkley sockets 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 will be terminated and closed when the connection to the dead socket
termination port is closed.

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 will need a separate
Telnet program to use this protocol.
The Series 2600B 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.
Configuring a Telnet connection
This procedure uses HyperTerminal
system. Consult the help system for your version of Microsoft Windows to identify a compatible tool.
To connect with the Series 2600B using HyperTerminal on a Windows XP system:
1. On the host computer, click Start > Accessories > Communications > HyperTerminal. The
Connection Description dialog box opens.
C-16
Series 2600B System SourceMeter® Instrument Reference Manual
TM
, which is available with the Microsoft
® ®
Windows XP operating
2600BS-901-01 Rev. B / May 2013