Wavecom WMOi3 Manual de usuario descargar pdf (Pagina 10)

WMOi3 Integrated modem 25/01/00

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3.2. Pin Description

3.2.1. Power supply

The main power supply will be provided through a double connection.

These connections are respectively the pin 3 and 4 for the +5V and

the pins 1 and 2 for the ground (GND).

The power supply is 5V +/-5% 1A.

3.2.2. Serial Link RS232

This interface is needed for communication with a remote terminalwith

respect to the RS232 V.28 standard levels. As the integrated modem

does not include a transceiver MAX3238 or MAX3237, this one has to be

added outside with a SUBD9 (connected to the integrated modem

through a short 10 or 12 wires cable for example). These transceiver and

SUBD9 can then be connected to the PC with a standard RS232 cable.

The table below lists the needed signals for this interface :

PIN number Signal Description

5 DCD Data Carrier Detect

28 RX Reception

25 TX Transmission

29 DTR Data Terminal Ready

27 DSR Data Set Ready

30 RTS Request To Send

13 CTS Clear To Send

9 RING Ring indicator

2 GND Ground

4 +5V Interface Power Supply

19 RST General Reset (optionnal)

23 BOOT Boot signal for downloading (optionnal)

When the RS232 V.28 level is not needed, the above signals can be

used as TTL 3V CMOS compatible signals.

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Wavecom WMOi3 Manual de usuario Pagina 10