MultiModemDSVD User Guide | 4 AT Commands, | ||||
Register | Unit | Range | Default | Description | |
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| 6 | Reserved. |
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| 7 An MNP connection is attempted and | |
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| if it fails, a normal modem connection |
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| is established. |
S37 | decimal | 0 | 0 | Sets the maximum V.34 speed at which the | |
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| modem attempts to connect. The default | |
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| value is an automode connection. If N0 is | |
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| active, connection is attempted at the most | |
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| recently sensed serial port speed (+MS= | |
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| command settings are updated to the ap- | |
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| propriate values). If N1 is active, connec- | |
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| tion is attempted at the highest possible | |
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| speed. (+MS= settings are updated to | |
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| 11,1,300,3360 to reflect V.34, automode, | |
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| 300 bps minimum speed, and 33600 bps | |
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| maximum speed). Supported only for | |
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| compatibility with existing software; use | |
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| the +MS= command instead. | |
S38 | seconds | Sets the delay between the modem’s receipt | |||
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| of the H command to disconnect (or high- | |
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| programmed to follow the signal), and the | |
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| disconnect operation. Applies only to error- | |
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| correction connections. This register can be | |
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| used to ensure that data in the modem buff- | |
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| er is sent before the modem disconnects. If | |
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| S38 is set to a value between 0 and 254, the | |
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| modem waits for the remote modem to ac- | |
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| knowledge all data in the modem buffer | |
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| before disconnecting. If S38 is set to 255, the | |
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| modem does not time out, and continues to | |
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| attempt to deliver data in the buffer until | |
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| the connection is lost or the data is delivered. | |
S46 | decimal | 136, 138 | 138 | Enables or disables data compression: | |
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| 136 Error correction without compression. | |
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| 138 Error correction with compression. | |
S48 | decimal | 0, 7, 128 | 7 | Enables or disables LAPM negotiation. An | |
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| invalid value is treated as a 128 value. | |
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| 0 | Disables negotiation and proceeds |
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| with LAPM. |
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| 7 | Enables negotiation. |
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| 128 | Disables negotiation and proceeds at |
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| once with the fallback action specified |
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| in S36. Can be used to force MNP. |
48 |