After installing the windows driver, the 3G USB modem appear and install on COM12 on my Win7 machine
Examine the report from USB Viewer shows a total of 12 endpoints. After examine the data log when using the modem, it is found the USB modem is installed on interface number 3 as highlighted below in BLUE
Device Descriptor:
bcdUSB: 0x0200
bDeviceClass: 0x00
bDeviceSubClass: 0x00
bDeviceProtocol: 0x00
bMaxPacketSize0: 0x40 (64)
idVendor: 0x2357
idProduct: 0x0201
bcdDevice: 0x0000
iManufacturer: 0x03
0x0409: "TP-LINK, Incorporated"
iProduct: 0x02
0x0409: "TP-LINK HSUPA Modem"
iSerialNumber: 0x04
0x0409: "@@@@@@@@@@"
bNumConfigurations: 0x01
ConnectionStatus: DeviceConnected
Current Config Value: 0x01
Device Bus Speed: High
Device Address: 0x02
Open Pipes: 12
Endpoint Descriptor:
bEndpointAddress: 0x81 IN
Transfer Type: Bulk
wMaxPacketSize: 0x0200 (512)
bInterval: 0x20
Endpoint Descriptor:
bEndpointAddress: 0x01 OUT
Transfer Type: Bulk
wMaxPacketSize: 0x0200 (512)
bInterval: 0x20
Endpoint Descriptor:
bEndpointAddress: 0x82 IN
Transfer Type: Bulk
wMaxPacketSize: 0x0200 (512)
bInterval: 0x20
Endpoint Descriptor:
bEndpointAddress: 0x02 OUT
Transfer Type: Bulk
wMaxPacketSize: 0x0200 (512)
bInterval: 0x20
Endpoint Descriptor:
bEndpointAddress: 0x84 IN
Transfer Type: Interrupt
wMaxPacketSize: 0x0040 (64)
bInterval: 0x05
Endpoint Descriptor:
bEndpointAddress: 0x85 IN
Transfer Type: Bulk
wMaxPacketSize: 0x0200 (512)
bInterval: 0x20
Endpoint Descriptor:
bEndpointAddress: 0x04 OUT
Transfer Type: Bulk
wMaxPacketSize: 0x0200 (512)
bInterval: 0x20
Endpoint Descriptor:
bEndpointAddress: 0x86 IN
Transfer Type: Interrupt
wMaxPacketSize: 0x0040 (64)
bInterval: 0x05
Endpoint Descriptor:
bEndpointAddress: 0x87 IN
Transfer Type: Bulk
wMaxPacketSize: 0x0200 (512)
bInterval: 0x20
Endpoint Descriptor:
bEndpointAddress: 0x05 OUT
Transfer Type: Bulk
wMaxPacketSize: 0x0200 (512)
bInterval: 0x20
Endpoint Descriptor:
bEndpointAddress: 0x03 OUT
Transfer Type: Bulk
wMaxPacketSize: 0x0200 (512)
bInterval: 0x00
Endpoint Descriptor:
bEndpointAddress: 0x83 IN
Transfer Type: Bulk
wMaxPacketSize: 0x0200 (512)
bInterval: 0x00
Configuration Descriptor:
wTotalLength: 0x008A
bNumInterfaces: 0x05
bConfigurationValue: 0x01
iConfiguration: 0x01
0x0409: "TP-LINK Configuration"
bmAttributes: 0xE0 (Bus Powered Self Powered Remote Wakeup)
MaxPower: 0xFA (500 Ma)
Interface Descriptor:
bInterfaceNumber: 0x00
bAlternateSetting: 0x00
bNumEndpoints: 0x02
bInterfaceClass: 0xFF
bInterfaceSubClass: 0xFF
bInterfaceProtocol: 0xFF
iInterface: 0x00
Endpoint Descriptor:
bEndpointAddress: 0x81 IN
Transfer Type: Bulk
wMaxPacketSize: 0x0200 (512)
bInterval: 0x20
Endpoint Descriptor:
bEndpointAddress: 0x01 OUT
Transfer Type: Bulk
wMaxPacketSize: 0x0200 (512)
bInterval: 0x20
Interface Descriptor:
bInterfaceNumber: 0x01
bAlternateSetting: 0x00
bNumEndpoints: 0x02
bInterfaceClass: 0xFF
bInterfaceSubClass: 0xFF
bInterfaceProtocol: 0xFF
iInterface: 0x00
Endpoint Descriptor:
bEndpointAddress: 0x82 IN
Transfer Type: Bulk
wMaxPacketSize: 0x0200 (512)
bInterval: 0x20
Endpoint Descriptor:
bEndpointAddress: 0x02 OUT
Transfer Type: Bulk
wMaxPacketSize: 0x0200 (512)
bInterval: 0x20
Interface Descriptor:
bInterfaceNumber: 0x02
bAlternateSetting: 0x00
bNumEndpoints: 0x02
bInterfaceClass: 0x08
bInterfaceSubClass: 0x06
bInterfaceProtocol: 0x50
iInterface: 0x00
Endpoint Descriptor:
bEndpointAddress: 0x03 OUT
Transfer Type: Bulk
wMaxPacketSize: 0x0200 (512)
bInterval: 0x00
Endpoint Descriptor:
bEndpointAddress: 0x83 IN
Transfer Type: Bulk
wMaxPacketSize: 0x0200 (512)
bInterval: 0x00
Interface Descriptor:
bInterfaceNumber: 0x03
bAlternateSetting: 0x00
bNumEndpoints: 0x03
bInterfaceClass: 0xFF
bInterfaceSubClass: 0xFF
bInterfaceProtocol: 0xFF
iInterface: 0x00
Endpoint Descriptor:
bEndpointAddress: 0x84 IN
Transfer Type: Interrupt
wMaxPacketSize: 0x0040 (64)
bInterval: 0x05
Endpoint Descriptor:
bEndpointAddress: 0x85 IN
Transfer Type: Bulk
wMaxPacketSize: 0x0200 (512)
bInterval: 0x20
Endpoint Descriptor:
bEndpointAddress: 0x04 OUT
Transfer Type: Bulk
wMaxPacketSize: 0x0200 (512)
bInterval: 0x20
Interface Descriptor:
bInterfaceNumber: 0x04
bAlternateSetting: 0x00
bNumEndpoints: 0x03
bInterfaceClass: 0xFF
bInterfaceSubClass: 0xFF
bInterfaceProtocol: 0xFF
iInterface: 0x00
Endpoint Descriptor:
bEndpointAddress: 0x86 IN
Transfer Type: Interrupt
wMaxPacketSize: 0x0040 (64)
bInterval: 0x05
Endpoint Descriptor:
bEndpointAddress: 0x87 IN
Transfer Type: Bulk
wMaxPacketSize: 0x0200 (512)
bInterval: 0x20
Endpoint Descriptor:
bEndpointAddress: 0x05 OUT
Transfer Type: Bulk
wMaxPacketSize: 0x0200 (512)
bInterval: 0x20
With these information, it is ready to get it to work on PIC24FJ256GB106.