usb rs232 problem

[Dennis_Knutson]

Have you used I/O Trace in MAX to capture what you are sending? Are you using the same cable from the old pc? If not, have you checked that the wiring is identical?

[NIMike42]

The old computer has a dedicated serial port for controling thedevice while the new one does not.  Thisis the reason I am using the usb to rs232 converter for the new program, and cannot use the old cable any more.  I amin the process of checking the voltage output of the cables.

In the meantime, I ran an I/O trace and have attached the .trace file attempting to communicate with serial device.  I am having issues interpreting the results, however.  I would like to know if anyone sees something sticking out to them from the analysis.  I will get back on the actual cable transmission soon.

[Dennis_Knutson]

The type of connector for a dedicated serial port and for a USB-RS232 converter should be exactly the same - a male DB9.

[NIMike42 · Accepted solution]

Thank you everyone for your replies and inshight.  I have found the solution to my problem.  After using a diagnostic tool to check which pins carry the signal, I found that my old cable actually sends and receives information in a reverse configuration (TS and RS).  I have resoldered my connector and it's working just fine now.  The USB cable is working fine, and the program works.

[Albert.Geven · Accepted solution]

You know why it is called RS232?

except for the official naming we use 

ReSolder pin 2 to 3 and pin 3 to 2.....

[NIMike42]

Thanks Albert for the insight.  I did not know the significance.