Appendix C: LAN concepts and settings
Model 2657A High Power System SourceMeter® Instrument Reference Manual
C-16
2657A-901-01 Rev. B/December 2012
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.
Telnet connection
Telnet is similar to raw socket, and can be used when you need to interact directly with the
instrument, typically for debugging and troubleshooting. Telnet requires a separate Telnet program.
The Model 2657A 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
TM
, which is available with the Microsoft
®
Windows
®
XP operating
system. Consult the help system for your version of Microsoft Windows to identify a compatible tool.
To connect with the Model 2657A using HyperTerminal on a Windows XP system:
1. On the host computer, click
Start > Accessories > Communications > HyperTerminal
. The
Connection Description dialog box opens.
Figure 141: Connection description dialog box
NOTE
My Instrument
Summary of Contents for 2657A
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