Rainbow-electronics GT864-PY Instrukcja Użytkownika Pobierz pdf (Strona 16)

GT864-QUAD/PY Hardware User Guide

1vv0300756 Rev.0 08/05/07

6 Serial Ports

The RS232 standard interface serves to connect a PC, Data Terminal Equipment (DTE) or an

application, which acts as host controller of the GT864 Terminal with all its functions. Through the

RS232 interface it can be used as GSM/GPRS modem for sending and receiving of SMS, Data and

Fax calls.

The Telit GT864-PY, on the basis of the EASY SCRIPT® feature and with a PYTHON script

developed by the user, can allow self-controlled operations which put the RS232 interface in a

different serial data transmission mode, e.g. to communicate with a sensor or actuator.

6.1.1 RS232 standard interface connector

Connector type on the terminal is:

• standard RS232 Sub-D 9pin female

• Baud rate from 300 to 115.200 bit/s

• Autobauding (300 to 38.400 bit/s)

The electrical characteristics of the serial port signals are shown below:

PIN Signal Direction Voltage levels Description

1 DCD Output

> + 4V

<- 4 V

Data carrier detect

2 RD Output

> + 4V

<- 4 V

Received data

3 TD Input

> + 2V

< 0.8 V

Transmitted data

4 DTR Input

> + 2V

< 0.8 V

Data terminal ready

5 GND - 0 V Ground connection

6 DSR Output

> + 4V

<- 4 V

Data set ready

7 RTS Input

> + 2V

< 0.8 V

Request to send

8 CTS Output

> + 4V

<- 4 V

Clear to send

9 RI Output

> + 4V

<- 4 V

Ring indicator

To connect to a PC as DTE, a pin-to-pin, 9 pin cable with D9 type connectors on both sides is needed

(1 male & 1 female). Shielding of this cable is recommended and its length shall not exceed 3m.

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