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GM862-GPS Hardware User Guide
1vv0300728 Rev. 0 - 27/04/06
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved page 20 of 55
The signals of the GM862-GPS MODEM serial port are:
RS232
Pin
Number
Signal GM862-
GPS Pin
Number
Name Usage
1 DCD -
dcd_uar
t
36 Data Carrier Detect Output from the GM862-GPS that
indicates the carrier presence
2 RXD -
tx_uart
37 Transmit line *see Note Output transmit line of GM862-GPS
UART
3 TXD -
rx_uart
20 Receive line *see Note Input receive of the GM862-GPS UART
4 DTR -
dtr_uart
43 Data Terminal Ready Input to the GM862-GPS that controls
the DTE READY condition
5 GND 2-4-6-8 Ground ground
6 DSR -
dsr_uart
33 Data Set Ready Output from the GM862-GPS that
indicates the module is ready
7 RTS -
rts_uart
45 Request to Send Input to the GM862-GPS that controls
the Hardware flow control
8 CTS -
cts_uart
29 Clear to Send Output from the GM862-GPS that
controls the Hardware flow control
9 RI -
ri_uart
30 Ring Indicator Output from the GM862-GPS that
indicates the incoming call condition
NOTE: According to V.24, RX/TX signal names are referred to the application side, therefore on the GM862-GPS side
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 GM862-GPS 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.
The signals in the UART connector on the EVK are:
DCD RXD
TXD DTR
GND DSR
RTS CTS
RI GND
The signals of the GPS serial port are: