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TC65 Hardware Interface Description

Confidential / Released

TC65_HD_V02.000 Page 38 of 120 08.06.2006

3.3.3.3 Turn on/off TC65 Applications with Integrated USB

In a Windows environment, the USB COM port emulation causes the USB port of TC65 to

appear as a virtual COM port (VCOM port). The VCOM port emulation is only present when

Windows can communicate with the module, and is lost when the module shuts down.

Therefore, the host application or Terminal program must be disconnected from the USB

VCOM port each time the module is restarted.

Restart after shutdown with AT^SMSO:

After entering the power down command AT^SMSO on one of the interfaces (ASC0, ASC1,

USB) the host application or Terminal program used on the USB VCOM port must be closed

before the module is restarted by activating the IGT line.

Software reset with AT+CFUN=x,1:

Likewise, when using the reset command AT+CFUN=x,1 on one of the interfaces (ASC0,

ASC1, USB) ensure that the host application or Terminal program on the USB VCOM port

be closed down before the module restarts.

Note that if AT+CFUN=x,1 is entered on the USB interface the application or Terminal

program on the USB VCOM port must be closed immediately after the response OK is

returned.

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