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AN39: USB Interface Description

3.2 Composite Device Interfaces for "MdmNet" Enumeration

HC15_USB_Interface_v02 Page 10 of 28 2007-04-05

Confidential / Preliminary

3.2 Composite Device Interfaces for "MdmNet" Enumeration

3.2.1 Interface 0 (VCOM Port)

Interface 0 implements two endpoints:

• Bulk-only data IN

• Bulk-only data OUT endpoint

Using the supplied host driver software for Windows XP this interface is implemented as a vir-

tual USB COM port and serves as so-called application port. The application port is intended

for controlling the module via AT commands or for receiving URCs. It can be used also for

sending, receiving, writing and reading short messages. The application port is not intended as

HSDPA or GPRS data interface.

3.2.2 Interface 1 (NET Port)

Interface 1 implements three endpoints:

• a bulk-only data IN,

• a bulk-only data OUT

• an interrupt IN notification endpoint

Using the supplied host driver software for Windows XP this interface serves as a wireless net-

work adapter intended for HSDPA and GPRS data connections. For details on how to use this

interface see [4].

3.2.3 Interface 2 (MODEM Port)

Interface 2 implements three endpoints:

• Bulk-only data IN,

• Bulk-only data OUT

• Interrupt IN notification endpoint

Using the supplied host driver software for Windows XP this interface is implemented as a

HSDPA USB modem and serves as so-called modem port. The modem port is particularly

intended for HSDPA and GPRS data connections. It can be used to set up dial-up network con-

nections.

Notes:

• The AT command parameter AT^SCFG="URC/DstIfc" can be configured to redirect output

URCs from the default and recommended Interface 0 (VCOM application port) to the

modem port (see [1], AT^SCFG). If the modem interface is used for redirected URCs and

blocked by an active data connection, the data connection should be suspended from time

to time to check for pending URCs.

• The interface’s notification endpoint is also employed for notifications from the interface 0

(VCOM). A USB host driver should therefore evaluate the interface number of the notifica-

tion interface (see [6], Section 6.3).

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