Then most likely your device will work with Apples class driver without
any additional stuff.
Abstract Line Control model is the right onw, the Direct Line Control
model is only for software modems (i.e. the host processor is generating
quasi audio signals that are just fed into the line by the USB device).
Abstract Line Control menas that the host just sends and receives the
payload data and leaves it up to the USB device to somehow transmit that
somewhere.
>Yes the device will have the Class Code as Communication Device Class.
>The device is an hand held device like PDA. As the device is still in
>development stage, I haven't tested. The sample source code
>"AppleUSBCDCDriver" given in the website is the Communication Device
>Class driver for the serial device like modem that has Communication
>Interface Class Subclass Code as Abstract Control Model. Since my device
>is not a modem, I don't know what Subclass I have to choose for the
>Communication Interface Class of my device. The requirement is I have to
>write a "TTY over USB driver" for a device of class Communication Device
>Class.
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