My guess is without checking with an oscilloscope that the Windows driver simply drops the DTR when the last character has been transferred from the Tx register to the Tx shift register, which on style chips can generate an interrupt. When “0” Space is transmitted, the RS transmitter is also enabled driving the line actively to the “0” “dominant” state. You want a build and walk away solution. As Paul K wrote below: I was hoping that someone else may have seen these problems before.

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Apr 17, donrronics. RS is a single twisted pair that must be shared by both Transmit and Receive. Actaully I have never done any windows programming, but the windows programmer working on my project dosen’t know anything about hardware, so I would like to design out these hardware problems if they are going to be an issue.

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Sign in Sign in Remember me Forgot username or password? If drivers don’t work on certain Windows versions and the manufacturer doesn’t have new drivers, you have to find a different USB-RS adapter. What about using Can? On 11 Feb When a “1” Mark bit is transmitted, the transmitter is switched off and the termination resistors pull the line to the “1” “recessive” state.

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The serial card is fantastically solid under all versions of Windows. Search Forums Recent Posts. A less reliable method which works surprisingly well on short distances is to run it in a similar way as the CAN bus was originally used with RS drivers before dedicated CAN drivers were available. Whilst being a fairly good device, I still have found a few problems which others may have experienced.

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Dkntronics least in some old modem system for which RS was originally designedthe DTE computer raises the RTS signal to advertise that it has something to send. It’s not that simple, you can’t do full-duplex on RS Because the cards are hardware compatible, the standard Windows driver works well.

Arduino Robotics Lonnie Honeycutt. Sure, it sucks, but that’s how you have to do it when you’ve got a crippled UART. Reply Start a New Thread. Apr 16, 1. PC sees it as a serial port.

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dpntronics Apr 19, 9. Introduction to Microcontrollers Mike Silva. I think the use of a circular buffer in the driver may solve the problem. Previous 1 2 3 4 Next.

Does a standard Windows without enabling multimedia timers really have timer interrupts every millisecond. My guess is without checking with an oscilloscope that the Windows driver simply drops the DTR when the last character has been transferred from the Tx register to the Tx shift register, which on style chips can generate an interrupt.

Other possibilities would be RS and RS It checks the shfit-register empty status bit every millisecond until true, then drops RTS.

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I was hoping that someone else may have seen these problems before. Apr 17, 4. On Wed, 11 Feb Apr 17, 6. Are you thinking of RS? Apr 20,