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Overview of Remote Control
LAN Remote Control System
Control over telnet server
In a control system that operates over the telnet server, communications are
performed through connection between the sockets provided by the processes
of the external controller and the E4981A to establish a network path between
them.
A socket is an endpoint for network connection; port 5024 and port 5025 are
provided for the sockets for the E4981A. Port 5024 is provided for
conversational control using telnet (user interface program for the TELNET
protocol) and port 5025 for control from a program.
Preparing the external controller
As in the case of the SICL-LAN server, you need to set the I/O interface of the
external controller in advance to establish communication to the E4981A using
the TCP/IP protocol. For the procedure, refer to
controller" on page 23
Conversational control using telnet (using port 5024)
You can use telnet to perform conversational control by sending SCPI
commands to the E4981A on a message-by-message basis. For telnet, the
socket of port 5024 is used for communications.
For port 5024, service requests are asynchronous. Also, use Ctrl+C to clear
the device.
In this example, to show you the control procedure using telnet, in a Windows
environment you control the E4981A from the external controller.
Step 1.
Open the MS-DOS command prompt screen.
Step 2.
At the MS-DOS prompt, type "telnet <IP Address>" and press Enter.
Step 3.
The telnet screen opens.
Step 4.
Type a command and press Enter; it is sent to the E4981A and executed. If
you enter a command that queries some data, the query response is
displayed below the line in which you entered the command.
Figure 2-4
using the :SOUR:FREQ command to set measurement frequency to
120Hz\1kHz, :CREJ? to check the low C reject status. The setting check is
made with the query after each setting.
Keysight E4981A 120 Hz/1 kHz/1 MHz Capacitance Meter
of the
"Control over SICL-LAN server"
shows the screen displaying the measured value with :FETC? after
"Preparing the external
section.
27
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