Read from serial port and store in hexadecimal

Question

I have a vhf radio which sent a status message continuosly through the serial port, and I need the messages that I got to be stored as hex data in a text file

I tried hexdump command as shown below, and the data that I've got from vhf radio is correct, but the problem with this script that when I execute it, it does not end until I press ctrl-c

d -A n -t x1 -w128 /dev/ttyS0 > file.txt

so I've tried another command which is read command as follow:

COUNTER=0
while [ $COUNTER -lt 10 ]; do
read -r -t1 -N128 DATA < /dev/ttyS0 
echo $DATA >> file1.txt
od -A n -t x1 -w128 file1.txt >> file2.txt
let COUNTER=COUNTER+1
done

but the data stored in file2.txt is not correct.

the message that I got from the radio is not in a format that I could interprete it as per the radio prtocol document. so when I said that the data is not correct I mean that the message is could not be interpreted (it received randomly)

note that I've setted the serial port before executing both scripts as follow:

stty -g /dev/ttyS0 raw
stty -F /dev/ttyS0 9600

so, please help me to figure this out. or gave me aother way to read from serial port.

Regards,

Solution

The Problem is solved :)

I tried to use hexdump command by setting -N to KB and it works successfuly

it reads from serial port until 1000 bytes and it stops

od -A n -N KB -t x1 -w128 /dev/ttyS0 > /tmp/filename.txt

so, thank you guys for your cooperation. I really appriciated.