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Appendix B – Detailed Examples

Multi-Tech Systems, Inc. AT Commands for Wireless Modems with IP Connectivity (S000333B) 48

Serial Communication Continued

Command Mode / Data Mode for Email

Email service: SMTP

through

AT#PUTMAIL

ENTRY FLOW

Enter in DATA mode:

The “Ok_Info_WaitingForData” message

sent to the host on the serial port indicates

the entry in DATA mode.

Modem ready to receive data from host.

This data will form the body of the email

Exit DATA mode:

1. The host ends the DATA mode by sending the

[CR][LF].[CR][LF] sequence on the serial port

2. The modem ends the DATA mode if an error

occurs by sending an error message to the

host (this message is not preceded by the

[CR][LF].[CR][LF] sequence)

Email service: POP3

through

AT#GETMAIL

OUTPUT FLOW

Enter in DATA mode:

The “Ok_Info_Mail” message sent to the

host on the serial port indicates the entry in

DATA mode.

The modem then immediately sends the

data received from the POP3 server to the

host.

Exit DATA mode:

1. The modem ends the DATA mode by

sending the [CR][LF].[CR][LF] sequence on

the serial port.

This sequence is sent in case of a positive

result or if an error occurs.

2. It's not possible for host to exit DATA mode

Command Mode / Data Mode for FTP

FTP service : FTP

through AT#FTPPUT

ENTRY FLOW

Enter in DATA mode:

The “Ok_Info_WaitingForData” message

sent to the host on the serial port indicates

the entry in DATA mode.

The modem is ready to receive the data from

the host for sending it.

This data will form the file on the FTP server.

Exit DATA mode:

1. The host ends the DATA mode by sending the

[ETX] character (not preceded by [DLE]) on

the serial port.

2. The modem ends the DATA mode if an error

occurs by sending an error message to the

host (this message is not preceded by the

[ETX] character).

[ETX] is CTRL+C in a keyboard.

[DLE] is CTRL+P in a keyboard.

FTP service : FTP

through AT#FTPGET

OUTPUT FLOW

Enter in DATA mode:

The “Ok_Info_DataBegin” message sent to

the host on the serial port indicates the

entry in DATA mode.

The modem then immediately sends the

data received from the FTP server to the

host.

Exit DATA mode:

1. The modem ends the DATA mode by

sending the [ETX] character (not preceded by

[DLE]) on the serial port.

This character is sent in case of a positive

result or if an error occurs.

2. It's not possible for host to exit DATA mode.

[ETX] is CTRL+C in a keyboard.

[DLE] is CTRL+P in a keyboard.

Command Mode / Data Mode for TCP Services: [ETX] means END of TCP connection

When DLEMODE is set to 1, the [ETX] character means a request or an indication of end of connection.

As a consequence, [ETX] characters that belongs to the payload data must be sent by the host on the serial port

preceded by a [DLE] character. Similarly [ETX] characters received by the modem from the Internet are sent to the host

through the serial port preceded by a [DLE] character

Socket TCP service :

TCP socket through

AT#LTCPSTART or

AT#OTCP

ENTRY FLOW

Enter in DATA mode:

The “Ok_Info_WaitingForData” message

sent to the host on the serial port indicates

the entry in DATA mode.

The modem is ready to receive the data from

the host.

This data will be sent to the remote TCP

peer.

Exit DATA mode:

1. The host ends the DATA mode by sending the

[ETX] character (not preceded by [DLE]) on

the serial port.

2. The modem ends the DATA mode if an error

occurs or if the TCP peer disconnects by

sending an error message to the host (this

message is preceded by the [ETX] character)

[DLE] is CTRL+P in a keyboard.

[ETX] is CTRL+C in a keyboard.

Socket TCP service :

TCP socket through

AT#LTCPSTART or

AT#OTCP

OUTPUT FLOW

Enter in DATA mode:

The “Ok_Info_WaitingForData” message

sent to the host on the serial port indicates

the entry in DATA mode.

The modem then immediately sends the

data received from the remote TCP peer to

the host.

Exit DATA mode:

1. The host ends the DATA mode by sending

the [ETX] character (not preceded by [DLE])

on the serial port.

2. The modem ends the DATA mode if an error

occurs or if the TCP peer disconnects by

sending a message to the host (this message

is preceded by the [ETX] character)

[ETX] is CTRL+C in a keyboard.

[DLE] is CTRL+P in a keyboard.

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