Specifications

AC65/AC75 Hardware Interface Description
3.3 Power-Up / Power-Down Scenarios
s
AC65_AC75_HD_v01.002 Page 30 of 117 2006-10-30
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which shall be altered to AT\Q3 (RTS/CTS handshake). If the application design does not integrate RTS/CTS
lines the host application shall wait at least for the "^SYSSTART" or "^SYSSTART AIRPLANE MODE" URC.
However, if the URCs are neither used (due to autobauding) then the only way of checking the module’s ready
state is polling. To do so, try to send characters (e.g. “at”) until the module is responding.
See also Section 3.3.2 Signal States after Startup
Figure 5: Power-on with operating voltage at BATT+ applied before activating IGT
EMERG_RST
VEXT
TXD0/TXD1/RTS0/RST1/DTR0 (driven by the application)
CTS0/CTS1/DSR0/DCD0
ca. 500 ms
Interface pins
Undefined
Defined
PWR_IND
t = 400ms
min
>
120ms
BATT+
IGT
HiZ
For details on how to use EMERG_RST to reset applications
or external devices see Section 3.3.1.6.