GE864-AUTO Hardware User Guide
1vv0300779 Rev.0 - 20/06/08
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved
page 32 of 62
The signals of the GE864-AUTO serial port are:
RS232
Pin
Number
Signal
GE864-
AUTO Pad
Number
Name
Usage
1
DCD - dcd_uart
D9
Data Carrier Detect
Output from the GE864-AUTO that indicates the
carrier presence
2
RXD - tx_uart
H8
Transmit line *see Note
Output transmit line of GE864-AUTO UART
3
TXD - rx_uart
E7
Receive line *see Note
Input receive of the GE864-AUTO UART
4
DTR - dtr_uart
B7
Data Terminal Ready
Input to the GE864-AUTO that controls the DTE
READY condition
5
GND
A1,F1,H1
L1, H2, L2,
J3, K3….
Ground
ground
6
DSR - dsr_uart
E11
Data Set Ready
Output from the GE864-AUTO that indicates the
module is ready
7
RTS -rts_uart
F7
Request to Send
Input to the GE864-AUTO that controls the
Hardware flow control
8
CTS - cts_uart
F6
Clear to Send
Output from the GE864-AUTO that controls the
Hardware flow control
9
RI - ri_uart
B6
Ring Indicator
Output from the GE864-AUTO that indicates the
incoming call condition
NOTE: According to V.24, RX/TX signal names are referred to the application side, therefore on
the GE864 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 GE864-AUTO 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.
