User's Manual

AC65/AC75 Hardware Interface Description
Confidential / Preliminary
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AC65/AC75_hd_v00.372 Page 38 of 118 2006-08-03
3.3.3.3 Turn on/off AC65/AC75 Applications with Integrated USB
In a Windows environment, the USB COM port emulation causes the USB port of
AC65/AC75 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.