User's Manual

GE865 Hardware User Guide

1vv0300799 Rev.6 - 04/06/09

The signals of the GE865 serial port are:

RS232

Number

Signal

GE865

QUAD

Pad

Number

Name

Usage

1 DCD - dcd_uart B5 Data Carrier Detect Output from the GE865 that indicates the carrier

presence

2 RXD -

tx_uart

A4 Transmit line *see Note Output transmit line of GE865 UART

3 TXD -

rx_uart

A3 Receive line *see Note Input receive of the GE865 UART

4 DTR - dtr_uart B3 Data Terminal Ready Input to the GE865 that controls the DTE READY

condition

5 GND C2, C7, E5,

E7, G1, G3,

G4, G5, H3,

Ground ground

6 DSR - dsr_uart B2 Data Set Ready Output from the GE865 that indicates the module is

ready

7 RTS -rts_uart A1 Request to Send Input to the GE865 that controls the Hardware flow

control

8 CTS - cts_uart A2 Clear to Send Output from the GE865 that controls the Hardware

flow control

9 RI - ri_uart B4 Ring Indicator Output from the GE865 that indicates the incoming

call condition

NOTE: According to V.24, RX/TX signal names are referred to the application side, therefore on

the GE865 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 GE865 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.