User's Manual

GC864 Hardware User Guide

1vv0300733 Rev. 0 - 12/06/06

The signals of the GC864 serial port are:

RS232 Pin

Number

GC864

Pad

Number

Signal Type Name Usage

3 25 C103/TXD I Serial data input (TXD) from DTE Input receive of the GC864 UART

2 26 C104/RXD O Serial data output to DTE Output transmit line of GC864 UART

6 27 C107/DSR O Output for Data set ready signal (DSR) to DTE Output from the GC864 that indicates the

module is ready

8 28 C106/CTS O Output for Clear to send signal (CTS) to DTE Output from the GC864 that controls the

Hardware flow control

4 29 C108/DTR I Input for Data terminal ready signal (DTR) from

DTE

Input to the GC864 that controls the DTE

READY condition

9 30 C125/RING O Output for Ring indicator signal (RI) to DTE Output from the GC864 that indicates the

incoming call condition

7 31 C105/RTS I Input for Request to send signal (RTS) from DTE Input to the GC864 that controls the

Hardware flow control

1 32 C109/DCD O Output for Data carrier detect signal (DCD) to

DTE

Output from the GC864 that indicates the

carrier presence

5 5,6,7 GND - Ground ground

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

the GC864 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 GC864 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.

The signals in the UART connector on the EVK2 are:

DCD RXD

TXD DTR

GND DSR

RTS CTS

RI GND