![](/images/new-backgrounds/1269522/26952245x1.webp)
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Register | Default | Function |
S38 | 0 | Sets an optional delay (in seconds) before a forced |
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| DTR drops during an ARQ call. This allows time for |
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| a remote modem to acknowledge receipt of all |
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| transmitted data before it is disconnected. |
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| When set at the default (0), the modem immediately |
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| hangs up when DTR drops. |
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| This option applies only to connections terminated by |
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| dropping DTR. If the modem receives the ATH |
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| command, it ignores S38 and immediately hangs up. |
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