NAME
umcs – ASIX/MosChip MCS7840/MCS7820 USB to serial UART driver
SYNOPSIS
device usb device ucom device umcs
In loader.conf(5): umcs_load="YES"
DESCRIPTION
The umcs driver provides support for various multiport serial adapters based on the ASIX/MosChip MCS7840 and MCS7820 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.
HARDWARE
The umcs driver supports the following USB to serial UART controllers based on the ASIX/MosChip MCS7840 and MCS7820:
-
ST Lab U-360 two-port serial USB adapter
-
ST Lab U-400 four-port serial USB adapter
FILES
- /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
SEE ALSO
HISTORY
The umcs driver appeared in ports since December of 2010.
AUTHORS
The umcs driver was written by Lev Serebryakov ⟨[email protected]⟩.
BUGS
This driver doesn't support access to any fine tunes of chip, like RS522/RS485 mode, non-standard baudrates, etc.