Question

kermit -- 0
Connecting to /dev/ttyUSB0, speed 115200
 Escape character: Ctrl-\ (ASCII 28, FS): enabled
Type the escape character followed by C to get back,
or followed by ? to see other options.
Session Log: /home/baifudong/logs/20231102-15:31:33.log, timestamped-text (0) 
?Carrier required but not detected.
***********************************
 Hint: To CONNECT to a serial device that
 is not presenting the Carrier Detect signal,
 first tell C-Kermit to:

   SET CARRIER-WATCH OFF

***********************************

Answer

set line /dev/ttyUSB\%1 # Use kermit -- 0 to connect to ttyUSB0
set speed 115200
set carrier-watch off
set handshake none
set flow-control none
robust
set file type bin
set file name lit
set rec pack 1000
set send pack 1000
set exit on-disconnect on
set window 5

.log_dir := ~/logs/
cd \m(log_dir)
set session-log timestamped
log session \v(ndate)-\v(time).log
connect