Nothing is connected to the serial ports at the moment, except for an oscilloscope that I am using to measure what is being transmitted (Tx pin). I'm not interested in anything on the receive side just yet.
At first I tried a legacy program that worked in MS-DOS 6.22 that I am trying to get working in FreeDOS - this program outputs data on COM1. The hardware that it is connected to does not use hardware flow control. No data appeared to be transmitted. When I couldn't get a reading on my scope I decided a more direct approach by piping direct from the console: ECHO TEST>COM1 When I do this I get: Error reading from device COM1: write fault (A)bort, (I)gnore, (R)etry, (F)ail? ________________________________ From: dmccunney <dennis.mccun...@gmail.com> Sent: Friday, 27 December 2019 11:55 PM To: Discussion and general questions about FreeDOS. <freedos-user@lists.sourceforge.net> Subject: Re: [Freedos-user] MODE not changing RTS or DTR of serial ports On Fri, Dec 27, 2019 at 6:13 PM Matt Jacobs <kexling...@hotmail.com> wrote: > I suspect that DTR/RTS being on is the reason why I cannot write to the > serial port. How are you *trying* to write to the serial port? What is connected to the port? How is it connected? DTR/RTS is hardware flow control, used to determine whether the device you are attempting to write to is ready to receive data. Hardware flow control requires that certain pins be connected in the cable. Incorrect pinouts on the cable's connectors may be your problem. ______ Dennis _______________________________________________ Freedos-user mailing list Freedos-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-user
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