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17-1
17 USB
USB FUNCTION
The transceiver operates as a USB 2.0 compliant USB
device.Italsosupportsthefollowingdeviceclasses.
CDC: CommunicationDeviceClass
ADC:AudioDeviceClass1.0
MSC:MassStorageClass
Note:
ThetransceiverdoesnotsupportbeingconnectedwithaPC
via a USB hub. Use a commercially available cable to connect
thetransceiverdirectlytoaUSBportofthePC.
CONNECTING WITH A PC
ConnectingthetransceivertoaPCenablesyoutousethe
memorycontrolprogramMCP-D74tocongurevarious
settingsandaccessfromthePCtothemicroSDmemory
card in the transceiver.
ToconnectthetransceiverwithaPC,youneedtoinstallthe
virtualCOMportdriveronthePC.
DownloadthememorycontrolprogramMCP-D74andvirtual
COMportdriverfromthefollowingURL.
https://www.kenwood.com/i/products/info/amateur/software_
download.html
(This URL may change without notice.)
Note:
NeverconnectthetransceiverandaPCwithaUSBcable
untilinstallationofthevirtualCOMportdriverdownloaded
fromtheaboveURLiscompleted.IfthetransceiverandaPC
areconnectedwithoutinstallingthevirtualCOMportdriver,
the wrong driver that does not support the transceiver will be
installedandcommunicatingcorrectlywiththePCwillbecome
impossible. To prevent the wrong driver from being installed, be
suretocompletetheinstallationofthevirtualCOMportdriver
beforeconnectingthetransceiverwiththePC.
Connecting to the PC
ConnecttothePCusingacommerciallyavailableUSBcable
(Type A-Micro-B).
Micro-USBConnector
(USB2.0, Type B)
USBCable
PC
Note:
TH-D74cannotbeconnectedtotheCOMportofthePC.
The communication speed (baud rate) is maximum 12 Mbps for
USB.
OPERATION SETTING
YoucanselectwhetherthetransceiveroperatesasaUSB
port and audio device or operates as a mass storage class
devicewhenitisconnectedwithaPC.
1 AccessMenuNo.980.
The USB operation function selection screen appears.
2 Select[COM+AF/IFOutput]or[MassStorage].
[COM + AF/IF Output]: The transceiver operates as
avirtualCOMportforserialdatacommunication,and
outputsoneoftheAF,IF,ordetectionsignalsbyUSB
audio.(IF/detectionsignaloutputcanbeswitchedbyMenu
No. 102.)
[Mass Storage]: The transceiver enters mass storage
mode.YoucanaccessthemicroSDmemorycardofthe
transceiverfromaPC.Thetransceiverwillbedisplayedas
aremovablediskonthePC.
• ActivatingMassStoragemodewillunmountthe
microSD memory card inserted in the transceiver. GPS
logs and received audios cannot be recorded. Exit
Mass Storage mode and remount the microSD memory
card.
• IfMassStorageisselected,the[MassStorageMode]
screen appears when the transceiver is connected to a
PC.
Disconnect
1 Click[SafelyRemoveHardware]onthePC.
2 DisconnecttheUSBcablefromthePC.
Note
When[MassStorageMode]isstarted,checkthatamicroSD
card is inserted in the transceiver.
In[MassStorageMode],operationsotherthanswitchingthe
power off cannot be performed.
In[MassStorageMode],RXandTXcannotbeperformed.
In[MassStorageMode],GPSlogrecordingandreception
sound recording cannot be performed.
SETTING USB AUDIO OUTPUT LEVEL
AdjusttheUSBaudiooutputleveltothePC.
1 AccessMenuNo.918.
2 Selectamongfrom[Level1]to[Level7].
97


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