User's Manual

GL865 Hardware User Guide
1vv0300910 Rev.1 – 2011-07-22
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved
page 42 of 79
The signals of the GL865 serial port are:
RS232
Pin
Number
Signal GL865
Pad Number
Name Usage
1 DCD - dcd_uart 1
Data Carrier
Detect
Output from the GL865 that
indicates the carrier
presence
2 RXD - tx_uart 8
Transmit line *see
Note
Output transmit line of
GL865 UART
3 TXD - rx_uart 7
Receive line *see
Note
Input receive of the GL865
UART
4 DTR - dtr_uart 4
Data Terminal
Ready
Input to the GL865 that
controls the DTE READY
condition
5 GND
32, 33,
35, 36, 46
Ground ground
6 DSR - dsr_uart 3 Data Set Ready
Output from the GL865 that
indicates the module is
ready
7 RTS -rts_uart 5 Request to Send
Input to the GL865 that
controls the Hardware flow
control
8 CTS - cts_uart 6 Clear to Send
Output from the GL865 that
controls the Hardware flow
control
9 RI - ri_uart 2 Ring Indicator
Output from the GL865 that
indicates the incoming call
condition
NOTE:
According to V.24, RX/TX signal names are referred to the
application side, therefore on the GL865 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
GL865 serial port and viceversa for RX.
NOTE:
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.
NOTE: