On Monday, November 24, 2003, at 06:22 PM, Sarah wrote:
I have found that on OS X the write needs to end in a LF with the serial drivers I use. I think this is a Revolution bug.
Hmmm, I'm not sure that it's a bug in Revolution. Using the Keyspan drivers and my device, I get strange behavior if I add an LF after the data I send. Things are fine if I send individual characters.
I think it was Sarah who said that you needed to use an LF with the Keyspan drivers in another case, so it might be a device specific thing.
Not guilty in this case :-)
I think Jason is right - it is device specific. I have tested a couple of different devices and one needs ASCII 13 while one needs CRLF. I haven't actually found one that needs LF on it's own. Dar reported problems using anything other than LF but that has not been my experience, at least not since Rev 2.1 when OS X serial actually started to work.
On my mac, on OS X on recent versions through 10.2.8 and Revolution with serial on OS X through 2.1.1, a LF is required for any data to go out on any device I have tested. It might be device specific, but it includes two USB adaptors and the internal modem, if so. I suspect that Revolution is not setting termios parameters completely. Maybe you two have used other software to access the devices and that software initialized some parameters that are remembered. I have considered using shell to try to fiddle with parameters before the open.
I think serial I/O bug reports are at a low priority.
Dar Scott
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