UMCS(4FREEBSD) - man page online | special files

USB support for serial adapters based on the MCS7820 and MCS7840 chips.

February 25, 2012
UMCS(4)                            BSD Kernel Interfaces Manual                           UMCS(4)


umcs — USB support for serial adapters based on the MCS7820 and MCS7840 chips


To compile this driver into the kernel, place the following lines in your kernel configura‐ tion file: device usb device ucom device umcs Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5): umcs_load="YES"


The umcs driver provides support for various multiport serial adapters based on the MosCom MCS7820 and MCS7840 chips. They are 2- or 4-port adapters with full-featured 16550-compati‐ ble UARTs and very flexible baud generators. Also, these chips support RS422/RS485 and IrDA operations. The device is accessed through the ucom(4) driver which makes it behave like a tty(4). Different ports on device are presented as sub-units, like /dev/ttyU0.1 and /dev/ttyU0.2.


The umcs driver was tested on the following adapters: · ST Lab U-360 two-port serial USB adapter · ST Lab U-400 four-port serial USB adapter


tty(4), ucom(4), usb(4)


The umcs driver appeared in ports since December of 2010.


The umcs driver was written by Lev Serebryakov ⟨⟩.


This driver doesn't support access to any fine tunes of chip, like RS522/RS485 mode, non- standard baudrates, etc.
BSD February 25, 2012 BSD
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umcs(4freebsd) referred by ucom(4freebsd)
refer to tty(4) | ucom(4freebsd) | usb(4freebsd)