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SCPI Socket Services
This instrument allow any combination of up to two simultaneous data socket, control socket, and telnet
connections to be made.
Keysight instruments have standardized on using port 5025 for SCPI socket services. A data socket on this port can
be used to send and receive ASCII/SCPI commands, queries, and query responses. All commands must be
terminated with a newline for the message to be parsed. All query responses will also be terminated with a newline.
The socket programming interface also allows a control socket connection. The control socket can be used by a
client to send device clear and to receive service requests. Unlike the data socket, which uses a fixed port number,
the port number for a control socket varies and must be obtained by sending the following SCPI query to the data
socket: SYSTem:COMMunicate:TCPip:CONTrol?
After the port number is obtained, a control socket connection can be opened. As with the data socket, all
commands to the control socket must be terminated with a newline, and all query responses returned on the
control socket will be terminated with a newline.
To send a device clear, send the string "DCL" to the control socket. When the power system has finished performing
the device clear it echoes the string "DCL" back to the control socket.
Service requests are enabled for control sockets using the Service Request Enable register. Once service requests
have been enabled, the client program listens on the control connection. When SRQ goes true the instrument will
send the string "SRQ +nn" to the client. The "nn" is the status byte value, which the client can use to determine the
source of the service request.
More About IP Addresses and Dot Notation
Dot-notation addresses ("nnn.nnn.nnn.nnn" where "nnn" is a byte value from 0 to 255) must be expressed with
care, as most PC web software interprets byte values with leading zeros as octal (base 8) numbers. For example,
"192.168.020.011" is actually equivalent to decimal "192.168.16.9" because ".020" is interpreted as "16" expressed
in octal, and ".011" as "9". To avoid confusion, use only decimal values from 0 to 255, with no leading zeros.
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Keysight EDU33210 Series User's Guide
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