User's Manual

Telit GM862-QUAD/-QUAD-PY
Hardware User Guide
1vv0300692, Rev. ISSUE#0, - 04/10/2005
Reproduction forbidden without DAI Telecom written authorization – All Right reserved – Right of modification reserved page 18 of 69
The signals of the GM862-QUAD serial port are:
RS232
Pin
Number
Signal GM862-
QUAD
Pin
Number
Name Usage
1 DCD -
dcd_uart
36 Data Carrier Detect Output from the GM862-QUAD that
indicates the carrier presence
2 RXD -
tx_uart
37 Transmit line *see Note Output transmit line of GM862-QUAD
UART
3 TXD -
rx_uart
20 Receive line *see Note Input receive of the GM862-QUAD
UART
4 DTR -
dtr_uart
43 Data Terminal Ready Input to the GM862-QUAD 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-QUAD that
indicates the module is ready
7 RTS -
rts_uart
45 Request to Send Input to the GM862-QUAD that controls
the Hardware flow control
8 CTS -
cts_uart
29 Clear to Send Output from the GM862-QUAD that
controls the Hardware flow control
9 RI -
ri_uart
30 Ring Indicator Output from the GM862-QUAD 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-QUAD 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-QUAD 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