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
