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GE863-PRO
3
Hardware User Guide
1vv0300773a Rev. 0 - 24/01/08
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 40 of 64
The signals of the GE863-PRO
3
GSM/GPRS engine serial port are:
RS232 Pin
Number
Signal
GE863-PRO
3
Ball
Name Usage
1 DCD -
dcd_uart
C7 Data Carrier Detect Output from the GE863-PRO
3
GSM/GPRS engine
that indicates the carrier presence
2 RXD -
tx_uart
E10 Transmit line *see Note Output transmit line of GE863- PRO
3
GSM/GPRS
engine
3 TXD -
rx_uart
E9 Receive line *see Note Input receive of the GE863- PRO
3
GSM/GPRS
engine
4 DTR -
dtr_uart
C6 Data Terminal Ready Input to the GE863- PRO
3
GSM/GPRS engine that
controls the DTE READY condition
5 GND All GND Ground Ground
6 DSR -
dsr_uart
C5 Data Set Ready Output from the GE863- PRO
3
GSM/GPRS engine
that indicates the module is ready
7 RTS -
rts_uart
C8 Request to Send Input to the GE863- PRO
3
GSM/GPRS engine that
controls the Hardware flow control
8 CTS -
cts_uart
C9 Clear to Send Output from the GE863- PRO
3
GSM/GPRS engine
that controls the Hardware flow control
9 RI -
ri_uart
C4 Ring Indicator Output from the GE863- PRO
3
GSM/GPRS engine
that indicates the incoming call condition
NOTE: According to V.24, RX/TX signal names are referred to the application side, therefore on the GE863-PRO
3
GSM/GPRS engine side these signal are on the opposite direction: TXD on the ARM application side will be
connected to the receive line (here named TXD/ rx_uart ) of the GE863-PRO3 GSM/GPRS engine serial 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.