On 2014-01-23, Grant Edwards wrote: > In applications like links using half-duplex modems, you may have to > assert RTS for many hundreds of millisconds to allow the modulator to > key up and stabilze and the demodulator to lock onto the signal before > you can send data. Some modems will let you know when they're ready > by asserting CTS, and for others you just have to have a fixed delay. > In those cases, you also typically hold RTS for some time after the > end of the data for a time ranging up to several byte times. > In our non-Linux based products, we implement pre/pose data RTS "hold" > times as you describe in our device driver. Our Linux-based products > can't handle those applications. I am glad to hear that there is at lease someone else out there who is using such old technology. We still use a kind of V.23 modems which work as you described in some projects in road traffic applications. Why haven't you tried to implement that applications on Linux? On slow baud-rates even an user-mode implementation should be possible in most cases? -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
