Standard AT Commands Supported
The Serial Device Server recognizes a subset of the standard AT command set. The data channel must be in the command mode for commands to be recognized. The data channel will be in command mode upon power up or reset.
There are two operating modes for the unit when the AT command option is enabled. In command mode, data received from the serial port is passed to the AT command processor, and responses are returned to the serial port. No data is sent to any network application, and any data received from the network is ignored. In data mode, data from the serial port passes to the network application, and vice versa. This is equivalent to the normal serial port operating mode without the AT command option.
Table 5 describes the AT Commands. Table 6 details the Extended AT Commands that allow the configuration of the network server operating parameters. Any AT command received, except the listed commands, are acknowledged with OK status. This allows existing modem applications to transmit commands without causing an error. These include AT<X>n, but not currently AT&<X>n, AT%<X>n, AT\ <X>n, where <X> is a letter.
Table 5 AT Commands
Parameter
Command
Description
| Enter Command mode | <delay>+++<delay> | If the string +++ is seen in data mode, with no | ||
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| characters sent for 1 second before or after, then | ||
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| command mode is entered. |
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| Initiate Connection | ATD <destination> | Standard modem dialing command, redefined to | ||
| Command |
| initiate an internet connection to a remote computer. | ||
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| Indicates the IP address of the target, and optionally the | ||
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| TCP port number to use for connection. The T or P | ||
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| option (ATDT or ATDP) can be present and has no effect. | ||
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| If present, the IP address must be exactly 12 decimal | ||
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| digits with 3 for each byte of the address. |
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| If no IP address is given, then the ECable destination | ||
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| address defined for the port is used. |
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| If the destination TCP port is defined, it is separated | ||
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| from the IP address by a '#' character, and is 1 to 5 | ||
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| decimal digits. |
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| If TCP port is defined, the ECable destination port | ||
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| defined for the serial port is used. If the destination | ||
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| port is 0, the standard Telnet port (23) is used. | ||
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| If the destination string ends with a semicolon, the | ||
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| server remains in the command mode, not the data | ||
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| mode, once a connection is made. |
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| In command mode data is not passed from the | ||
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| remote computer, so data could be lost if the unit | ||
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| stays in command mode. |
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| If the connection cannot be attempted, NO CARRIER | ||
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| status is returned. If the connection attempt fails, NO | ||
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| ANSWER status is returned. |
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| If the connection succeeds, CONNECT status is | ||
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| returned. |
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| Advanced Configuration | Silex | Page 29 | ||
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