User manual

RS-232C Serial Interface Connector:

Since the GSM Gateway in its data mode is a regular modem, the connector pins are

exactly the same as in an ordinary modem, see Fig. 9. For the PC connection, a non-cross-

over (1:1) extension cable – the same as for the connection of a PC and external modem –

is used. The maximum cable length is in excess of 30 metres and depends on the PC – it

may be a little trial and error is needed to find an exact maximum length.

Fig. 9.: Serial RS-232C interface connector

1 DCD

2 RxD

3 TxD

4 DTR

5 GND

6 DSR

7 RTS

8 CTS

9 RI

5 4 3 2 1

9 8 7 6

5.1.2. Front Cover Part Disassembly

The remaining elements such as the fuse or the input and output terminals are not

accessible until you remove the front cover part, which is clicked into the bottom cover

part slots and held by its own flexibility. First remove the upper cover face to grasp the

front cover part easily and pull it out. The front cover part includes a panel with LED

indicators – the connection cable is detachable from the motherboard.

Fig. 10: Front cover disassembly