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Although serial ports are disappearing, they can still be useful.
Here is a COMMs UDF. It provides an easy way to use serial ports without the restrictions and problems some methods have. USB to serial is ok, binary data is ok.
This UDF requires my comMG.dll which can be in either the script folder or the Windows folder by default, or in the path specified using the function _CommSetDllPath.
Note the following shortcomings:
the dll link below is 32 bit so it will not work with a 64 bit apps, but there is a 64 bit version in my post around 25th March 2018 for people to try.
The strings and character functions are all AnsiChar.
Functions in the UDF are
_CommSendBreak; not tested!!!!!!!!!!
_CommSetRTS (NB these will not work if Hardware handshaking is selected because
_CommSetDTR then these lines are controlled by the data being sent.)
Go to Download Page For Commgv2
Download includes the dll and udf.
Most recent changes
28th March 2014 - dll V2.83
Correct error setting 6 data bits as 7.
11th March 2014 dll V2.82
Allow data bits of 4 to 8 instead of only 7 and 8.
19th August 2013
dll v2.81 removes some unwanted eroor message popups. Might not remove popups for some Windows versions.
27th September 2012
Correct error closing port. New version of UDF if V2.90, new dll is commg.dll V2.79. Thanks to tfabris.
18th January 2012
Corrected typo in UDF V 2.87, and uploaded as V2.88
Increased max baud allowed by the dll from 200000 to 256000. New version now V2.78
17th January 2012
Modified thesleep addition to _CommGetLine so that reading data is not slowed down.
14th January 2012
Corrected _CommReadByte in UDF.
Added sleep(20) to while loop in _CommGetLine to reduce CPU usage
20th December 2011
UDF version 2.86. - Changed function GetByte so it returned the error string given by the dll.
Dll version 2.77 - removed an unwanted erro message dialogue from GetByte function. (Thanks funkey)
4th December 2011
New dll and example versions. Dll function SetPort corrected because it was not using the parameters passed for DTR and RTS.
The example was setting flow control incorrectly: the settings for hardware handshaking and XON./XOFF were reversed.
25th August 2011 corrected function _CommClosePort.
Example corrected for setting parity and flow 22nd December 2013 (thanks to MichaelXMike)
I can easily find my modem comport number using the code below:-
#include <FileConstants.au3> #include <MsgBoxConstants.au3> #include <WinAPIFiles.au3> Global $key = RegRead("HKLM\HARDWARE\DEVICEMAP\SERIALCOMM","\Device\ssudmdm0000") Local $iError = 0 If @error Then ; The server is probably offline/port is not opened on the server. $iError = @error MsgBox(BitOR($MB_SYSTEMMODAL, $MB_ICONHAND), "", "Client:" & @CRLF & "Could not connect, Error code: " & $iError) Else MsgBox($MB_ SYSTEMMODAL, "MODEM:", $key) EndIf
but the thing is I am planning to design a small tool by which it can read the modem COM port and set the COM number and send AT command to modem port using UDF CommMG.au3 created by Martin. I added some below code to martins file :-
;====================================================================================================================== ;CommSendStandard,a new function for sending information to a serial port. ;====================================================================================================================== Func _CommSendStandard($port,$error,$command) _CommSetPort($port,$error,9600,8,0,1,2) if $error <> '' Then MsgBox(262144,'Port Error = ',$error) EndIf _CommSendString($command & @CR) EndFunc ;==>_CommGetLineStates ;=============================================================================================== After adding I wrote the below code for sending AT command to modem port but its not working.
Please check the below code and let me know for the issue.
;===================================================================================== #include "C:\Program Files (x86)\AutoIt3\SciTE\CommMG.au3" #include <FileConstants.au3> #include <MsgBoxConstants.au3> #include <WinAPIFiles.au3> Global $key = RegRead("HKLM\HARDWARE\DEVICEMAP\SERIALCOMM","\Device\ssudmdm0000") Local $iError = 0 If @error Then ; The server is probably offline/port is not opened on the server. $iError = @error MsgBox(BitOR($MB_SYSTEMMODAL, $MB_ICONHAND), "", "Client:" & @CRLF & "Could not connect, Error code: " & $iError) Else MsgBox($MB_SYSTEMMODAL, "MODEM:", $key) EndIf Local $port=$key Local $porterror _CommSendStandard($port,$portError,"AT+CFUN=1,1") ;================================================================================================ but If I set the port number by my own in the code (for eg :- port number 8 or any value instead of $key) it works fine and the modem gets reset.I want to know if there is any way to get the port number to a variable $port and discarding so that my above code works fine...In that case user donot have to take care of entering the port manually everytime and the script will automatically read the port number and set itself.
I have several different devices connected to my desktop PC with USB COM adapters.
Sometimes there is some error that will cut my USB COM device communication (usualy caused by lose USB connector)... After reconnecting that USB COM adapter, by some reason, Windows will give it different COM port number.
I know there are some devices with integrated COM port circuit and they are used by client programs that can found them and only them by some USB hardware relate details and then use their COM port to communicate with correct COM device.
It would be better to define some known and static hardware related string from device managers USB COM adapter details to my script config file, than always redefine different COM port to it.
How can I do this trick with autoit?
I communicate COM devices with cfxUDF.au3 AutoIt UDF.
I have written an AutoIt program that communicates with a RFXCOM transciever to control my home. This program runs 24/7 and occasionally I get the following message in a modal window:
Line 6102 (File "C:\homecontrol\HC.exe"):
Error: Missing right bracket ')' in expression.
My program waits for an operator input. So I have lost control and I am not able to terminate the program and start it again. Since my program has only a few hundred lines the error must be in one of the libraries. My questions are:
What is causing this error?
How can I trap this error?
In which library is this error generated?
This are my includes:
In the code I have already an error trap:
$objErr = ObjEvent("AutoIt.Error","MyErrFunc")
This topic is a complement of therealhanuta´s >CommAPI - Serial and parallel communication with Windows API
I think these routines are great, as they are simple to use, and use windows API with NO DLL´s.
It is about tips in receiving binary data thru a serial port, including value 0 (=end of string**). I hope it can help someone..
To know about the UDF to read/write serial port, please refer to the above link, with focus at post #3 and over
First, what is a binary stream? As an example, a microcontroler (PIC) getting data thru ADC and sending the 2 adquired bytes straight thru serial, without any treatment.
Now supose the message has: 1 letter(A-Z) + 4 ADC values + 3 counters of anything (each one byte). Your message will arrive with 1 + 4 x 2 + 3 = 12 bytes (or as AU3 sees it, a "string" with 12 "chars").
$sResult = _CommAPI_ReceiveData($hFile) will have at $sResult a "string" with 12 "chars" ** besides the first one, all other chars have byte values. On them can exist even binary value 0. So, it´s vital that 0 be not interpreted as end of string by receiver (PC) now let´s separate the 1 + 4 + 3 = 8 fields field1= StringMid($sResult,1,1) ;this is just a characte rbetwen A-Z field2= ASC(StringMid($sResult,2,1)) ;LSB of the ADC value. First byte = LSBb, 2nd. byte = MSB field2= field2 + ASC(StringMid($sResult,3,1))*256 ;MSB of ADC => now field2 has LSB + MSB (betwen 0-65535) ;field3..5 are similar to field 2, just increase by one the start position in stringMid field6= ASC(StringMid($sResult,10,1)) ;now field6 a "number" betwen 0-255; ;field7-8 are similar to field 6, just increase by one the start position in stringMid ** - be carefull, as probably $sResult = _CommAPI_ReceiveData($hFile) will get just the chars avaiable at the moment of call, so a kind of test/loop will be necessary to get all them, something like
$sResult="" DO $sResult = $sResult & _CommAPI_ReceiveData($hFile) UNTIL stringLentgth($sResult) >= 12 Jose
** thanks Martin into explaining about hex (0) to be interpreted as end-of-string and not xoff.