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Chapter 8
Subclass request
SetCommFeature
Description
The host sends this request to control the settings for a particular communications
8
feature. Not used for serial emulation.
GetCommFeature
ClearCommFeature
SetLineCoding
GetLineCoding
SetControlLineState
SetBreak
The host sends this request to get the current settings for a particular communications
feature. Not used for serial emulation.
The host sends this request to clear the settings for a particular communications
feature. Not used for serial emulation.
The host sends this request to configure the ACM device settings in terms of baud rate,
number of stop bits, parity type and number of data bits. For a serial emulation, this
request is sent automatically by a serial terminal each time you configure the serial
settings for an open virtual COM port.
The host sends this request to get the current ACM settings (baud rate, stop bits, parity,
data bits). For a serial emulation, serial terminals send this request automatically during
virtual COM port opening.
The host sends this request to control the carrier for half duplex modems and indicate
that Data Terminal Equipment (DTE) is ready or not. In the serial emulation case, the DTE
is a serial terminal. For a serial emulation, certain serial terminals allow you to send this
request with the controls set.
The host sends this request to generate an RS-232 style break. For a serial emulation,
certain serial terminals allow you to send this request.
Table 8-4 ACM Requests Supported by Micriμm
Micriμm’s ACM subclass uses the interrupt IN endpoint to notify the host about the current
serial line state . The serial line state is a bitmap informing the host about:
■
Data discarded because of overrun
■
Parity error
■
Framing error
■
State of the ring signal detection
■
State of break detection mechanism
■
State of transmission carrier
■
State of receiver carrier detection
122
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