![]() I say fairly as the interrupt handler of the control CommEvents never worked as quickly or as well as I was expecting it to. VB6 used MSComm32.ocx this was a 32 bit version of MSComm16.ocx both of these components worked fairly well. RS-485 detailed at the end, RS-422 & RS-449 and on to allow very long cable runs and high speeds all follow the same basic path. If the port is idle, the port is at high level (or -12v), which is why if you look at circuit diagrams of peripherals, there is always a lot of invertors. The area of -3v to 0 to +3v is taken as not valid to allow for noise and interference on the line. RS-232 is the best known method of PC Communications, the characteristics of RS232 is a logic 1 (true) is can range from -3v to -25v a logic 0 (false) +3v to +25v. Please note: If you try to run the executable on a machine with no comms port in the Device Manager, it will crash. I will when I have chance, correct this! To get around this, please ensure a Communication Port is available in Device Manager. ![]()
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