Network Hardware User Manual

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

The signals of the UC864-E serial port are:

RS232

Number

Signal

UC864-E

Pad

Number

Name Usage

1 DCD

dcd_uart

32 Data Carrier Detect Output from the UC864-E that indicates the

carrier presence

2 RXD

tx_uart

26 Transmit line *see Note Output transmit line of UC864-E UART

3 TXD

rx_uart

25 Receive line *see Note Input receive of the UC864-E UART

4 DTR

dtr_uart

29 Data Terminal Ready Input to the UC864-E that controls the DTE

READY condition

5 GND 5,6,7 Ground Ground

6 DSR

dsr_uart

27 Data Set Ready Output from the UC864-E that indicates the

module is ready

7 RTS

rts_uart

31 Request to Send Input to the UC864-E that controls the

Hardware flow control

8 CTS

cts_uart

28 Clear to Send Output from the UC864-E that controls the

Hardware flow control

9 RI

ri_uart

30 Ring Indicator Output from the UC864-E that indicates the

incoming call condition

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

the UC864-E 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 UC864-E 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.