Multitech MMCModem GPRS (MTMMC-G) Manual de usuario descargar pdf (Pagina 30)

Chapter 4 – Data Exchange for Protocol Services

Multi-Tech Systems, Inc. IP Connectivity AT Commands for GPRS-F4 Wireless Modems (PN S000437C) 30

Socket Data Exchange +WIPDATA Continued

Shutdown Procedure for a TCP Socket

Mapping/Unmapping of a Mapped UDP and TCP Socket

When a TCP socket is unmapped and still active, it is possible to map it again in another mode that is

different from the previous one without closing the TCP socket.

The UART switches back to AT mode due to “+++” with a 1 second guard time before and after the

sequence or by sending an AT+WIPDATA=<proto>,<index>,0 on another UART in AT mode. This applies

to both UPD and TCP protocols.

When +++ is issued, the Wireless CPU

switches from DATA mode to AT mode. If the ATO command is

used to switch the Wireless CPU

back to DATA mode, then one of two things can happen:

• +CME ERROR:3 will be received when GPRS bearer is used

• no response is received when GSM bearer is used

To switch the Wireless CPU

back to DATA mode, AT+WIPDATA=x,x,x should be used instead of ATO.

After executing AT+WIPDATA=x,x,x command, "CONNECT" will be received to indicate that the Wireless

CPU

is switched back to DATA mode.

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Multitech MMCModem GPRS (MTMMC-G) Manual de usuario Pagina 30