Snoop the Serial Stream of an Ext. App.
Posted on 1998-11-16
I often have to decode down/upload serial protocols for various PLC and factory automation equipments. Currently I use an external cable box that picks up the transmit/recieve lines and actively Or's the two together. The combined signals are then sent to the RX line of a second serial port where another app reads the data and stores it to a file for post analysis.
I would like to build a Win95 VB app using MSCOMM (or anything else) that accomplishes the same internally i.e. it must capture the serial data from a serial port that is being sent by another process (Usually a DOS app in Win95). The data rates are as high as 56K baud.
Is there any way of watching another process's serial communication in code.
The simpler the better !