Improbs

Is it possible to control an instrument that uses an IT-E131 cable?

9 posts in this topic

#1 ·  Posted

I need to remotely control an instrument  that uses an IT-E131 cable - is this possible through Autoit? 

 

 

 

Share this post


Link to post
Share on other sites



#2 ·  Posted (edited)

just serial right?  there are plenty of serial comm threads (i think a UDF as well) that should help.

Edited by iamtheky

,-. .--. ________ .-. .-. ,---. ,-. .-. .-. .-.
|(| / /\ \ |\ /| |__ __||| | | || .-' | |/ / \ \_/ )/
(_) / /__\ \ |(\ / | )| | | `-' | | `-. | | / __ \ (_)
| | | __ | (_)\/ | (_) | | .-. | | .-' | | \ |__| ) (
| | | | |)| | \ / | | | | | |)| | `--. | |) \ | |
`-' |_| (_) | |\/| | `-' /( (_)/( __.' |((_)-' /(_|
'-' '-' (__) (__) (_) (__)

Share this post


Link to post
Share on other sites

#3 ·  Posted

Yes, the IT-E131 is serial. 

I've been able to control other instruments through RS232, GPIB, and ethernet cables, but I've been unable to control a DC electronic load that uses the IT-E131 cable. I was wondering if Autoit supports communication through IT-E131 cables. I can't find any other mentions of IT-E131 in this forum.  

Share this post


Link to post
Share on other sites

#4 ·  Posted

What OS and terminal do you use with this setup?  How can you not send commands, at the very least, as keystrokes to the terminal...


,-. .--. ________ .-. .-. ,---. ,-. .-. .-. .-.
|(| / /\ \ |\ /| |__ __||| | | || .-' | |/ / \ \_/ )/
(_) / /__\ \ |(\ / | )| | | `-' | | `-. | | / __ \ (_)
| | | __ | (_)\/ | (_) | | .-. | | .-' | | \ |__| ) (
| | | | |)| | \ / | | | | | |)| | `--. | |) \ | |
`-' |_| (_) | |\/| | `-' /( (_)/( __.' |((_)-' /(_|
'-' '-' (__) (__) (_) (__)

Share this post


Link to post
Share on other sites

#5 ·  Posted

"What OS and terminal do you use with this setup? "

OS on computer: Windows 7 professional 

Terminal on computer I'm using: RS232 port

Terminal on instrument I'm trying to use: TTL  


 

Share this post


Link to post
Share on other sites

#6 ·  Posted

Can you check e.g. with an oscilloscope that your TTL<-->RS232 cable and your load instrument (BK ?) TTL port are both correctly working independantly?

Then port settings should obviously match. After that there is no reason why the setup shouldn't work.


This wonderful site allows debugging and testing regular expressions (many flavors available). An absolute must have in your bookmarks.
Another excellent RegExp tutorial. Don't forget downloading your copy of up-to-date pcretest.exe and pcregrep.exe here
RegExp tutorial: enough to get started
PCRE v8.33 regexp documentation latest available release and currently implemented in AutoIt beta.

SQLitespeed is another feature-rich premier SQLite manager (includes import/export). Well worth a try.
SQLite Expert (freeware Personal Edition or payware Pro version) is a very useful SQLite database manager.
An excellent eBook covering almost every aspect of SQLite3: a must-read for anyone doing serious work.
SQL tutorial (covers "generic" SQL, but most of it applies to SQLite as well)
A work-in-progress SQLite3 tutorial. Don't miss other LxyzTHW pages!
SQLite official website with full documentation (may be newer than the SQLite library that comes standard with AutoIt)

Share this post


Link to post
Share on other sites

#7 ·  Posted

I got it working, thanks. _CommSetPort initializes the instrument. I was having trouble sending commands to the instrument - it's resolved now. 

Share this post


Link to post
Share on other sites

#8 ·  Posted (edited)

any idea what the problem was, or can you show the working code?  Comm threads are few and far between, as are troubleshooting steps.  Plus then you reach 5 posts and can engage in the debauchery that is Chat.

Edited by iamtheky

,-. .--. ________ .-. .-. ,---. ,-. .-. .-. .-.
|(| / /\ \ |\ /| |__ __||| | | || .-' | |/ / \ \_/ )/
(_) / /__\ \ |(\ / | )| | | `-' | | `-. | | / __ \ (_)
| | | __ | (_)\/ | (_) | | .-. | | .-' | | \ |__| ) (
| | | | |)| | \ / | | | | | |)| | `--. | |) \ | |
`-' |_| (_) | |\/| | `-' /( (_)/( __.' |((_)-' /(_|
'-' '-' (__) (__) (_) (__)

Share this post


Link to post
Share on other sites

#9 ·  Posted

To turn the instrument on, I had to send an a 26 byte array to the instrument. Initially, I was having trouble building a byte array and sending that byte array to the instrument. I built a structure instead and sent it to the instrument and it worked. 

 

This code works to put the 8502 Electronic Load in 'remote' mode (needs to be done before any other commands can be sent to the instrument):

Global $iPort = 1
Global $iBaud = 38400
Global $iByteSize = 8
Global $iParity = 0
Global $iStopBits = 1
Global $iSetFlow = 0
Global $sportSetError = ''
Global $ValRTS = 0
Global $ValDTR = 0

Global $NumerOfBytes = 26

Func Initialize_8502_DC_Electronic_Load()

   _CommSetPort($iPort, $sportSetError, $iBaud, $iByteSize, $iParity, $iStopBits, $iSetFlow, $ValRTS, $ValDTR)
   Sleep(200)
   If @error <> 0 Then
      MsgBox(0, "ERROR", "Device did not connect. Will exit program.")
      Exit
   EndIf

   _CommClearInputBuffer()
   _CommClearOutputBuffer()
   sleep(500)


   $Struct1 = DllStructCreate("byte[" & $NumerOfBytes & "]")  ;$NumerOfBytes = command length
   ConsoleWrite("Building command structure to turn on 'Remote' mode." & @CRLF)
   For $index = 1 To 26 ;for 26 bytes
      If $index = 1 Then
         $byte = 170
         $sum = $byte
      ElseIf $index = 2 Then
         $byte = 0
         $sum = $sum + $byte
      ElseIf $index = 3 Then
         $byte = 32
         $sum = $sum + $byte    
      ElseIf $index = 4 Then
         $byte = 1
         $sum = $sum + $byte
      ElseIf $index < 26 Then
         $byte = 0
         $sum = $sum + $byte
      ElseIf $index = 26 Then
         $byte = Mod($sum,256) ;last byte needs to be modulo of the total sum of previous 25 bytes and the integer 256
      EndIf
      DllStructSetData($Struct1, 1, $byte, $index) ;builds the 26 byte structure 
      Sleep(100)
   Next

   _CommSendByteArray(DllStructGetPtr($Struct1), $NumerOfBytes, 1) ;sends byte structure to instrument

;~    $return_data = Binary(_CommGetLineModified())  
;~    ConsoleWrite("Value of return data: " & $return_data & @CRLF)


   If @error Then
      MsgBox(0, 'ERROR', 'Unable to send byte array. Will exit program.')
      Exit
   EndIf

   _CommClearInputBuffer()
   _CommClearOutputBuffer()
   sleep(500)

EndFunc

 

 

 

1 person likes this

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now