User's Manual

GM862-QUAD / PY Hardware User Guide
1vv0300748 Rev. 1 - 24/10/06
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved page 32 of 70
The signals of the GM862-QUAD / PY MODEM serial port are:
RS232
Pin
Number
Signal GM862-
QUAD /
PY Pin
Number
Name Usage
1 DCD -
dcd_uart
36 Data Carrier Detect Output from the GM862-QUAD / PY that
indicates the carrier presence
2 RXD -
tx_uart
37 Transmit line *see Note Output transmit line of GM862-QUAD / PY
UART
3 TXD -
rx_uart
20 Receive line *see Note Input receive of the GM862-QUAD / PY
UART
4 DTR -
dtr_uart
43 Data Terminal Ready Input to the GM862-QUAD / PY that controls
the DTE READY condition
5 GND 2-4 Ground Ground
6 DSR -
dsr_uart
33 Data Set Ready Output from the GM862-QUAD / PY that
indicates the module is ready
7 RTS -
rts_uart
45 Request to Send Input to the GM862-QUAD / PY that controls
the Hardware flow control
8 CTS -
cts_uart
29 Clear to Send Output from the GM862-QUAD / PY that
controls the Hardware flow control
9 RI -
ri_uart
30 Ring Indicator Output from the GM862-QUAD / PY 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 /
PY 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 / PY serial port and vice versa 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 of the TRACE serial port are:
Signal GM862-
QUAD /
PY Pin
Number
Name Usage
RX_TRACE 41 Python Debug Receive
line
Input line of Python Debug serial Port
TX_TRACE 35 Python Debug Transmit
line
Output line of Python Debug serial Port
GND 2-4 Ground Ground