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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 configuration 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-compatible 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
/dev/ttyU*.* for callin ports /dev/ttyU*.*.init /dev/ttyU*.*.lock corresponding callin initial-state and lock-state devices /dev/cuaU*.* for callout ports /dev/cuaU*.*.init /dev/cuaU*.*.lock corresponding callout initial-state and lock-state devices
The umcs driver appeared in ports since December of 2010.
The umcs driver was written by Lev Serebryakov <lev@FreeBSD.org>.
This driver doesn't support access to any fine tunes of chip, like RS522/RS485 mode, non- standard baudrates, etc.