Telit Wireless Solutions manual Signals of the GE864 serial port are

The signals of the GE864 serial port are:

GE864 Hardware User Guide

1vv0300694 Rev.10 - 10/06/08

RS232 Pin

Number

1

2

3

4

5

6

7

8

9

Signal

DCD –

dcd_uart

RXD – tx_uart

TXD – rx_uart

DTR –

dtr_uart

GND

DSR –

dsr_uart

RTS –

rts_uart

CTS –

cts_uart

RI – ri_uart

GE864-

QUAD / PY

Pad

Number

D9

H8

E7

B7

A1,F1,H1,L1

,H2, L2, J3, K3…. E11

F7

F6

B6

Name

Data Carrier Detect

Transmit line *see Note

Receive line *see Note

Data Terminal Ready

Ground

Data Set Ready

Request to Send

Clear to Send

Ring Indicator

Usage

Output from the GE864-QUAD / PY that indicates

the carrier presence

Output transmit line of GE864-QUAD / PY UART

Input receive of the GE864-QUAD / PY UART

Input to the GE864-QUAD / PY that controls the

DTE READY condition

ground

Output from the GE864-QUAD / PY that indicates

the module is ready

Input to the GE864-QUAD / PY that controls the

Hardware flow control

Output from the GE864-QUAD / PY that controls

the Hardware flow control

Output from the GE864-QUAD / PY 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 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.

TIP: In order to avoid noise or interferences on the RXD lines it is suggested to add a pull up resistor (100Kohm to 2.8V)

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