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(Новая страница: «The modem is represented in the system by two devices: <code>/dev/ttyGSM</code> (link to one of the console ports ttymxc), connected to the UART-interface of the…») |
(Новая страница: «The presence of two interfaces allows you to simultaneously use the first device (<code>/dev/ttyGSM</code>) to send AT-commands (to know the level of the cellular…») |
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The modem is represented in the system by two devices: <code>/dev/ttyGSM</code> (link to one of the console ports ttymxc), connected to the UART-interface of the modem chip, and a composite USB-device <code>/dev/ttyACM0-6</code>, used for communication <code>ttyACM0</code>. The limitations of the UART port do not allow to realize the full potential of data transfer rate in 3G networks (theoretically up to 7.2 Mbit/s for reception and up to 5.76 Mbps for transmission). The port ttyACM0 is limited only by the transmission speed of USB2.0 (theoretically, up to 280 Mbps). | The modem is represented in the system by two devices: <code>/dev/ttyGSM</code> (link to one of the console ports ttymxc), connected to the UART-interface of the modem chip, and a composite USB-device <code>/dev/ttyACM0-6</code>, used for communication <code>ttyACM0</code>. The limitations of the UART port do not allow to realize the full potential of data transfer rate in 3G networks (theoretically up to 7.2 Mbit/s for reception and up to 5.76 Mbps for transmission). The port ttyACM0 is limited only by the transmission speed of USB2.0 (theoretically, up to 280 Mbps). | ||
The presence of two interfaces allows you to simultaneously use the first device (<code>/dev/ttyGSM</code>) to send AT-commands (to know the level of the cellular signal, send SMS, USSD-balance request etc) through minicom or gammu programs, and the second is (<code>/dev/ttyACM0</code>) for network communication. | |||
В контроллере доступна аппаратное управление включением/выключением модема через его вход PWRKEY, состояние которого управляется одним из GPIO процессора. Для пользователя интерфейс управления питанием модема предоставляет команда <code>wb-gsm</code> с опциями on, off, reset, restart_if_broken. | В контроллере доступна аппаратное управление включением/выключением модема через его вход PWRKEY, состояние которого управляется одним из GPIO процессора. Для пользователя интерфейс управления питанием модема предоставляет команда <code>wb-gsm</code> с опциями on, off, reset, restart_if_broken. |
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