UMODEM(4)

📦
version 15.1 · 3 versions
, in freebsd 14.5, freebsd 15.1, nixpkgs unstable

💖 NAME 💖

umodem — USB Communication Device Class serial (CDC ACM) driver. this is the umodem(4) page from the Kernel Interfaces Manual, and bestie, it's giving USB modem main character energy 💅

✨ SYNOPSIS ✨

okay so to compile this driver into the kernel, put these lines in your kernel configuration file, fr fr:

device usb
device ucom
device umodem

alternatively, to load the driver as a module at boot time, put this line in loader.conf(5):

umodem_load="YES"

🦋 DESCRIPTION 🦋

the umodem driver provides support for USB modems and serial devices that implement the Communication Device Class Abstract Control Model (CDC ACM). it also provides device-side CDC ACM support. supported modems are basically standard serial line modems, but they're accessed via USB instead — yes, the whole vibe is “serial but make it USB” 🔥. they support a regular AT command set. the commands can either be multiplexed with the data stream or handled through separate pipes. in the latter case, the AT commands have to be given on a device separate from the data device.

the device is accessed through the ucom(4) driver, which makes it behave like a tty(4). periodt.

🔌 HARDWARE 🔌

devices supported by the umodem driver include:

  • 3Com 5605
  • Curitel PC5740 Wireless Modem
  • Kyocera AH-K3001V Mobile Phone(WILLCOM)
  • Kyocera WX320K Mobile Phone(WILLCOM)
  • Metricom Ricochet GS USB wireless modem
  • Sierra MC5720 Wireless Modem
  • Yamaha Broadband Wireless Router RTW65b
  • ELSA MicroLink 56k USB modem
  • Sony Ericsson W810i phone
  • Sonim XP5300 Force

🎀 FILES 🎀

  • /dev/ttyU* — for callin ports
    • /dev/ttyU*.init and /dev/ttyU*.lock — corresponding callin initial-state and lock-state devices
  • /dev/cuaU* — for callout ports
    • /dev/cuaU*.init and /dev/cuaU*.lock — corresponding callout initial-state and lock-state devices

🌈 SEE ALSO 🌈

📜 HISTORY 📜

the umodem driver appeared in NetBSD 1.5. this manual page was adopted from NetBSD by Tom Rhodes <trhodes@FreeBSD.org> in April 2002. iconic crossover behavior, no cap.

💀 BUGS 💀

⚠️ bug check, bestie: only modems with multiplexed commands and data are supported at the moment. that's the caveat, fr fr.

xoxo, this page is from Debian, dated April 26, 2017, and it's the UMODEM(4) page signing off 💖🎀🫶

📦 where this page comes from