Multitech MMCModem GPRS (MTMMC-G) Manual de usuario descargar pdf (Pagina 6)

Chapter 1 – Introduction

Multi-Tech Systems, Inc. IP Connectivity AT Commands for GPRS-F4 Wireless Modems (PN S000437C) 6

Multiplexing: Several sockets can be operating at once. The +WIPDATA command allows to

temporarily identify the UART in data mode with a given socket. The data written on UART is

transferred through the socket. The data which arrives on the socket can be read from the UART. In

AT mode, the host receives an unsolicited event when the data arrives on the socket.

Multiple UARTs: There can be several UARTs simultaneously active at once, and different UARTs

can map a different socket simultaneously. However, you cannot map a single socket on several

UARTs simultaneously.

Socket Identification

Sockets are identified by a pair of numbers: the first one identifies the protocol; the second one

identifies a given socket of this protocol.

Possible Protocols

The possible protocols are:

• 1 = UDP

• 2 = TCP in connect mode (Client)

• 3 = TCP in listen mode (Server)

• 4 = FTP

Two pairs with a different protocol number but the same index identify two distinct sockets.

Example: Both 1,7 and 2,7 are valid identifiers simultaneously; the former identifies a UDP socket

and the later, a TCP connected socket.

Number of Sockets

The number of sockets per protocol is limited.

• UDP: 8 sockets

• TCP Clients: 8 sockets

• TCP Servers: 4 sockets

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Multitech MMCModem GPRS (MTMMC-G) Manual de usuario Pagina 6