Belkin F5D7234 router serial connection

#Belkin F5D7234-4 v5
#https://wikidevi.com/wiki/Belkin_F5D7234-4_v5
#CPU1: Broadcom BCM5355A1 (333 MHz)
#FLA1: 2 MiB (Winbond 25Q16BVSIG)
#RAM1: 8 MiB (Winbond W9864G6IH-6)
#      J102
#       (GND) (RxD) (TxD) [3.3]

screen /dev/ttyUSB0 115200,cs8,-parenb,-cstopb,-hupcl

#other options
stty raw -echo < /dev/ttyUSB0
cat /dev/ttyUSB0

#!!!!Unable to get any shell!!!#
#promted to press ctrl-c, but device does not recognize that it has been pressed.