Telit Wireless Solutions manual Signals of the UC864-E serial port are

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

The signals of the UC864-E serial port are:

RS232		UC864-E
Pin	Signal	Pad	Name
Number		Number
1	DCD	32	Data Carrier Detect
	dcd_uart
2	RXD	26	Transmit line *see Note
	tx_uart

3	TXD	25	Receive line *see Note
	rx_uart
4	DTR	29	Data Terminal Ready
	dtr_uart
5	GND	5,6,7	Ground
6	DSR	27	Data Set Ready
	dsr_uart
7	RTS	31	Request to Send
	rts_uart
8	CTS	28	Clear to Send
	cts_uart
9	RI	30	Ring Indicator
	ri_uart

Usage

Output from the UC864-E that indicates the

carrier presence

Output transmit line of UC864-E UART

Input receive of the UC864-E UART

Input to the UC864-E that controls the DTE

READY condition

Ground

Output from the UC864-E that indicates the

module is ready

Input to the UC864-E that controls the

Hardware flow control

Output from the UC864-E that controls the

Hardware flow control

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.

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