Appendix C: LAN concepts and settings Model 2651A High Power System SourceMeter® Instrument Reference Manual
C-14 2651A-901-01 Rev. A / March 2011
Confirming port numbers
To view the port number assigned to each remote interface protocol:
1. From the front panel, press the MENU key, and then select LAN > STATUS > PORT.
2. Use the navigation wheel
to select one of the following:
• RAW-SOCKET
• TELNET
• VXI-11
• DST
3. Press the ENTER key to view the port number.
4. Press the EXIT (LOCAL) key once to return to the PORT menu.
The following table displays the remote interface protocols supported by the Model 2651A and their
assigned port numbers.
Port number
Command interface Port number
Raw socket 5025
Telnet 23
VXI-11 1024
DST (Dead Socket Termination) 5030
Selecting a remote command interface
This section provides details on how to select a remote command interface to connect to the Model
2651A.
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 VISA software is required. Test Script Builder (TSB) uses VISA
and can be used with the VXI-11 interface. You can expect a slower connection with this protocol.
Raw socket connection
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.
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.
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