ucycom(4) device driver for Cypress CY7C63743 and CY7C64013 USB to RS232 bridges


To compile this driver into the kernel, place the following line in your kernel configuration file:
device usb device ucom device ucycom

Alternatively, to load the driver as a module at boot time, place the following line in loader.conf5:



The driver provides support for the Cypress CY7C63743 and CY7C64013 bridge chips. These chips were designed to provide a low-cost transition path to USB for existing RS232 devices, and have fairly limited capabilities.

The driver behaves like a tty(4).


The driver currently supports the following devices which incorporate Cypress USB to RS232 bridge chips:

  • DeLorme Earthmate USB GPS receiver


The driver first appeared in Fx 5.3 .


An -nosplit The driver and this manual page were written by An Dag-Erling Smørgrav Aq [email protected] .