User's Manual

GE/GC864-QUAD V2 and GE864-GPS Hardware User Guide
1vv0300915 Rev.2 – 2011-06-15
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Reserved. Page 60 of 97
NOTE:
According to V.24, RX/TX signal names are referred to the
application side, therefore on the GE/GC864-QUAD V2 AND
GE864-GPSside these signal are on the opposite direction: TXD
on the application side will be connected to the receive line
(here named TXD/RX_uart ) of the GE/GC864-QUAD V2 AND GE864-
GPSserial port and viceversa for RX
TIP:
For a minimum implementation, only the TXD and RXD lines can
be connected, the other lines can be left open provided a
software flow control is implemented.
NOTE:
In order to avoid a back powering effect it is recommended to
avoid having any HIGH logic level signal applied to the
digital pins of the module when is powered OFF or during an
ON/OFF transition.
9.2. GE864-GPS Secondary Ports
9.2.1. Modem Serial Port 2 (GPS Control)
This port is the only communication interface with the GPS
part. It is available on the following pins:
BALL
NAME
DESCRIPTION
TYPE
D11 TX_AUX TX Data for GPS
control
CMOS 2.8V
F10 RX_AUX RX Data for GPS
control
CMOS 2.8V
Please note that in order for GPS to be controlled by the GSM
section, the GPS UART and some GPS control signals have to be
connected externally to the GSM section according to the
following table (see also chapter 12):