Interactive SourceMeter® Instrument Reference Manual Section 2:
2461-901-01 A/November 2015 2-61
SDC
The selective device clear (SDC) event is similar to the device clear (DCL) event. However, the SDC
event clears the interface for an individual instrument instead of clearing the interface of all
instruments.
When the Model 2461 detects an SDC event, it will do the following for the selected instrument:
• Clears the input buffer, output queue, and command queue
• Cancels deferred commands
• Clears any command that prevents the processing of any other device command
An SDC event does not affect instrument settings and stored data.
SPE, SPD
When the instrument detects the serial polling enable (SPE) and serial polling disable (SPD) events, it
sends the status byte of the instrument. This contains the serial poll byte of the instrument.
The serial poll byte contains information about internal functions. See the Status model (on page C-1)
for detail. Generally, the serial polling sequence is used by the controller to determine which of
several instruments has requested service with the SRQ line.
LAN communications
You can communicate with the instrument using a local area network (LAN). The LAN interface can
be used to build flexible test systems that include web access. This section provides an overview of
LAN communications for the Model 2461.
When you connect using a LAN, you can use a web browser to access the internal web page of the
instrument and change some of the instrument settings.
The Model 2461 is an LXI version 1.4 Core 2011 compliant instrument that supports TCP/IP and
complies with IEEE Std 802.3 (ethernet LAN). There is one LAN port (located on the rear panel of the
instrument) that supports full connectivity on a 10 Mbps or 100 Mbps network. The Model 2461
automatically detects the speed.
The Model 2461 also supports Multicast DNS (mDNS) and DNS Service Discovery (DNS-SD), which
are useful on a LAN with no central administration.
Contact your network administrator to confirm your specific network requirements before setting up a
LAN connection.
If you have problems setting up the LAN, refer to LAN troubleshooting suggestions (on page 2-68).
LAN cable connection
The Model 2461 includes a Model CA-180-3A cable (LAN crossover cable). You can use this cable
for the TSP-Link
®
network or LAN communications.
However, you can use any standard LAN crossover cable (RJ-45, male to male) or straight-through
cable to connect your equipment. The instrument automatically senses which cable you have
connected.
The following figure shows the location of the LAN port on the rear panel of the instrument. Connect
the LAN cable between this connection and the LAN port on the computer.
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