Im trying to reverse engineer a very old DOS program that connects with a machine using RS232, for this i setup a typical in the middle connection like this:
From Computer A to PC A connection im using a standard RS232 crossover cable with this configuration:
And feeding both lines to my PC using Serial to USB converters, for monitoring the software i'm using Device Monitoring Studio and setting it to bridge all communications between PCA and PCB
It apparently works fine but after some time the communication breaks, I have double checked the connections, the transfer options (It seems to be 9600 8N1) and redo the cable, if i try other transfer options like changing the speed or the handshake or the start / stop bits the communication wont even start
Any ideas on why the communication is suddenly stopping? what else can you suggest to monitor the communication on a Windows 7 x64 machine (or maybe linux)?