Python Socket Control 1

Carl M · Post by **Carl M** » November 20th, 2009, 5:03 pm

For the instruments that support it.

## Python Socket Control 1
# Date: 09-15-2009
# ==================
# Demonstrate how to communicate with Tektronix instruments using an TCP socket
# connection.
#
# COMPATIBILITY
# ==================
# All Windows based instruments with TekVISA v3.2 or later
# AWG400, 500, 600, 700
# ==================
#
# TESTED & DEVELOPED
# ==================
# Microsoft Windows XP SP3
# Python v2.6
# Ethernet (DHCP)
# DPO7254 FW v4.3.5 Build 6
# ==================
#
# Tektronix provides the following example "AS IS" with no support or warranty.
 
import socket
 
input_buffer = 2 * 1024
 
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect(("134.62.63.56", 4000))
 
cmd = "*idn?" + "\n"
s.send(cmd)
id = s.recv(input_buffer)
print id
 
cmd = "*rst" + "\n"
s.send(cmd)
 
s.close()

springday · Post by **springday** » August 23rd, 2010, 4:24 pm

When I tried your example, I got an error message saying:
'No connection could be made because the target machine actively refused it'

How can I get around that?
Thanks.

springday · Post by **springday** » August 24th, 2010, 10:32 am

I got around the previous error message.

Now I have another question. I have the following code to try to get hardcopy from the o'scope:

Code: Select all

        self.write("HARDCOPY:PORT ETHErnet")
        self.write("HARDCOPY:FORMAT BMP")
        self.write("HARDCOPY START")

        self.write("*WAI")

        fOut = file('tds.bmp', 'wb')
        wf = self.inst.recv(65536)
        fOut.write(wf)
        fOut.close()

However, what I received from the scope was:

...HTTP/1.1 100 Continue

I had no problem with the code when I communicated with the scopy via GPIB module. Now I am hoping to do the same thing over Ethernet. How can I get a hardcopy of scope screen image via a socket?

Thanks

Carl M · Post by **Carl M** » September 9th, 2010, 4:21 pm

springday wrote:When I tried your example, I got an error message saying:
'No connection could be made because the target machine actively refused it'

How can I get around that?
Thanks.

firewall? socket server not started? wrong ip address? there are countless reasons why network connections are refused.

Carl M · Post by **Carl M** » September 9th, 2010, 4:24 pm

springday wrote:
...HTTP/1.1 100 Continue

you cannot just connect to the first open port you find. your talking to a web server (likely escope). i doubt your instrument has socket support.

Code: Select all

# COMPATIBILITY
# ==================
# All Windows based instruments with TekVISA v3.2 or later
# AWG400, 500, 600, 700
# ==================

Lei_ZTR_Control · Post by **Lei_ZTR_Control** » October 10th, 2018, 1:32 pm

Hi Carl,

I am using your program test my system. When I run the code, I constantly get the following response from TBS2000. Can you please advise what can go wrong here? I am using Python3.7 and just changed the cmd with encode() method and the id with the decode() method.

Many thanks.

Lei

UNKNOWN 400 Bad Request
Server: thttpd/2.25b 29dec2003
Content-Type: text/html; charset=UTF-8
Date: Wed, 10 Oct 2018 16:15:50 GMT
Last-Modified: Wed, 10 Oct 2018 16:15:50 GMT
Accept-Ranges: bytes
Connection: close
Cache-Control: no-cache,no-store

<HTML>
<HEAD><TITLE>400 Bad Request</TITLE></HEAD>
<BODY BGCOLOR="#cc9999" TEXT="#000000" LINK="#2020ff" VLINK="#4040cc">
<H2>400 Bad Request</H2>
Your request has bad syntax or is inherently impossible to satisfy.
<HR>
<ADDRESS><A HREF="http://www.acme.com/software/thttpd/">thttpd/2.25b 29dec2003</A></ADDRESS>
</BODY>
</HTML>

Lei_ZTR_Control · Post by **Lei_ZTR_Control** » October 11th, 2018, 9:54 am

This has been solved. The issue was the firmware in the scope does not support sockets. After upgrading the firmware, it's working now.

Thanks.

Tektronix and Keithley

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