EGS5 Hardware Interface Description
3.3 Power Up / Power Down Scenarios
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EGS5_HD_v02.004
Page 37 of 123
2012-02-09
Confidential / Released
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Figure 8:
Signal states during turn-off procedure
Note: Depending on capacitance load from host application
3.3.3.2
Turn on/off EGS5 Applications with Integrated USB
In a Windows environment, the USB COM port emulation causes the USB port of EGS5 to ap-
pear as a virtual COM port (VCOM port). The VCOM port emulation is only present when Win-
dows 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.
