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Register | Default | Function |
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S25 | 5 | Sets the duration (in hundredths of a second) that | ||||
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| DTR must be dropped in order to be interpreted as a | ||||
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| DTR loss. Allows the modem to differentiate | ||||
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| between a random glitch and a true DTR loss. | ||||
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| In most cases, the default value can be used. The S25 | ||||
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| register is useful for setting compatibility with older | ||||
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| systems running under older operating software. | ||||
S26 | 0 | Reserved. |
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S27 | 0 | |||||
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| instructions for S13. | ||||
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| Bit | Value | Result |
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| 0 | 1 | Enables | ||
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| 300 bps for overseas calls; in V.21 | |
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| mode, the modem answers both | |
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| overseas and domestic (U.S. And | |
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| Canada) calls, but only originates | |
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| V.21 calls. (Default Bell 103) | |
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| 1 | 2 | Enables | ||
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| coded) modulation in V.32 mode. | |
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| 2 | 4 | Disables V.32 modulation. | ||
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| 3 | 8 | Disables 2100 Hz answer tone to | ||
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| allow two V.42 modems to | |
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| connect more quickly. | |
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| 4 | 16 | Enables V.23 fallback mode. | ||
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| 5 | 32 | Disables V.32bis mode. | ||
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| 6 | 64 | Reserved. | ||
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| 7 | 128 | Software compatibility code. This | ||
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| setting disables the codes and | |
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| displays the 9600 code instead. | |
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| The actual rate of the call can be | |
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| viewed on the ATI6 screen. Used | |
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| for unusual software | |
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| incompatibilities. Some software | |
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| may not accept 7200, 12000 and | |
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| 14400 bps or greater result codes. | |
S28 | 0 | Eliminates the V.32 answer tones for a faster | ||||
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| connection. |
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| 8 | Default item, all times are in tenths of a second. | ||||
| 255 | Disables all connections except V.32 at 9600 bps. | ||||
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