Open-socket LAN control with Python (port 5025)

Most Siglent instruments expose a raw TCP socket on port 5025. You send SCPI text commands, terminated with a newline, and read text back. No VISA layer, no vendor drivers — ideal for lean production scripts, Linux servers and embedded controllers.

A minimal SCPI socket client

import socket

HOST = '192.168.1.121'   # your instrument's IP
PORT = 5025              # Siglent raw-SCPI socket

def scpi(sock, cmd):
    sock.sendall((cmd + '\n').encode())
    if cmd.endswith('?'):
        return sock.recv(4096).decode().strip()
    return None

with socket.create_connection((HOST, PORT), timeout=3) as s:
    print(scpi(s, '*IDN?'))
    scpi(s, 'C1:BSWV FRQ,1000')      # example: set CH1 frequency (SDG)
    print(scpi(s, 'C1:BSWV?'))

Siglent Technologies,SDG2042X,SDG2XCAD1R0001,2.01.01.35R3
C1:BSWV WVTP,SINE,FRQ,1000HZ,AMP,4V,OFST,0V,PHSE,0

Which models have the 5025 socket?

Most current instruments do, but it is not universal and the pattern is not the one people expect. Siglent publishes the definitive list; these are the groups as of this writing.

Which services a given model offers is published by Siglent in Instrument Socket and Telnet Port Information. Check it before assuming — the pattern is not uniform across the range, and the power supplies in particular offer the socket but not Telnet.

For the models in the bottom row, use the VXI-11 method — same Python, different transport; see the related note.

Where to find the SCPI commands

Every instrument family has a programming guide PDF in its Downloads section on this site, listing all commands with examples. The pattern above works unchanged for oscilloscopes, generators, spectrum analyzers, power supplies and loads.