lxi-tools TTi PL303QMD-P connection help required

[lambcutlet]

Hi,
I need some help using 'script' in lxi-tools.
lxi-tools version 2.6, fedora dnf install.

In the 'script' window i have this. Which does not work.

Code: [Select]

psu = lxi_connect("192.168.1.124", 9221, nil, 2000, "RAW") --
print("psu id = " .. lxi_scpi(psu, "*IDN?"))
lxi_disconnect(psu)
Using the 'scpi' window I can send '*IDN?'', using a manual configured, ip address, RAW/TCP, 9221. This works.
Even using a simple bash script I can get a response.

Code: [Select]

#!/bin/bash

IP_ADDR=192.168.1.124
PORT=9221

lxi benchmark --address $IP_ADDR --raw --port $PORT

lxi scpi --address $IP_ADDR --raw --port $PORT "*IDN?"
lxi scpi --address $IP_ADDR --raw --port $PORT "v1 12.34"
lxi scpi --address $IP_ADDR --raw --port $PORT "v1?"
But the 'script' window has me stumped.
Can anyone provide advice?

[tautech]

Suggest you engage directly with the developer:
https://www.eevblog.com/forum/testgear/open-source-lxi-tools-v2-0-released/

[lambcutlet]

Hi Lundmar,

Testing to find the cause I copied
https://github.com/lxi-tools/lxi-tools/blob/master/examples/lua/basics.lua
And dropped this into 'script' in the GUI. This fails. Reporting

Code: [Select]

[string "buffer"]:103: attempt to call a nil value (field 'pow')Even running the same program from the commandline results in

Code: [Select]

lua: test.lua:103: attempt to call a nil value (field 'pow')
stack traceback:
test.lua:103: in main chunk
[C]: in ?
Realised then when i run

Code: [Select]

psu = lxi_connect("192.168.1.124", 9221, nil, 2000, "RAW") --
print("psu id = " .. lxi_scpi(psu, "*IDN?"))
lxi_disconnect(psu) This also fails with 'attempt to call nil value'.

Any idea why this is?
Is there a package that needs installed?

Lua version 5.4.4

[lundmar]

Hi Lundmar,

Testing to find the cause I copied
https://github.com/lxi-tools/lxi-tools/blob/master/examples/lua/basics.lua
And dropped this into 'script' in the GUI. This fails. Reporting

Code: [Select]

[string "buffer"]:103: attempt to call a nil value (field 'pow')Even running the same program from the commandline results in

Code: [Select]

lua: test.lua:103: attempt to call a nil value (field 'pow')
stack traceback:
test.lua:103: in main chunk
[C]: in ?


Turns out that math.pow() has been deprecated by lua. Instead we need to use the math operator "^". I've updated the lua script to use this.

Realised then when i run

Code: [Select]

psu = lxi_connect("192.168.1.124", 9221, nil, 2000, "RAW") --
print("psu id = " .. lxi_scpi(psu, "*IDN?"))
lxi_disconnect(psu) This also fails with 'attempt to call nil value'.

Any idea why this is?
Is there a package that needs installed?

Lua version 5.4.4

I'm not sure. The documentation for your instrument does state that it only supports socket (raw) communication on port 9221 so it should work.

I can connect to my R&S NGM202 PSU using the following raw connect test script:
https://github.com/lxi-tools/lxi-tools/blob/master/examples/lua/connect-raw.lua

[lundmar]

FYI - lxi-tools had a regression so that the print() function printed the output to the console of the application instead of the console of the gui.

This is now fixed in the recently released lxi-tools v2.7.

So if the problem is that you didn't see any response, that is why.

[lambcutlet]

Hi Lundmar,

Installed lxi-tools via 'snap' version 2.7
And I can confirm I now receive a valid *IDN? response.
Also the lua script math.pow to '^' works. As you described.

Thankyou
consider this closed

[lundmar]

Hi Lundmar,

Installed lxi-tools via 'snap' version 2.7
And I can confirm I now receive a valid *IDN? response.
Also the lua script math.pow to '^' works. As you described.

Thankyou
consider this closed

No worries. And thank you for pointing me to this issue. It lead me to making the new release.