User Manual

GM862-QUAD / PY Hardware User Guide
1vv0300748 Rev. 5 - 20/09/07
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 31 of 68
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