Model 325 Temperature Controller- serial communication

I am trying to connect to the controller using RS-232 serial port. I am using python to connect. The aim of the project is to read temperature from the controller and save it as metadata with other instruments in my lab.

I was able to connect and send the message on serial port, but the reply I get is strangely encoded and does not match the manual.

>> ser = serial.Serial('/dev/ttyUSB1') # Serial Device

>> mess = "*IDN?\r\n" # Query for identification
>> ser.write(mess.encode()) # Send Query

>> ser.read(30) # Receive the message

The Message I receive is:

b'L\xd3CI,\xcdO\xc4EL\xb32\xb5,L\xd3\xc127\xb0\xc8,1\xae8/1\xae1\r'

According to the manual, I should get:

LSCI,MODEL325,1234567,1.0/1.0

For some reason, I am not getting correct ASCII bytes for 'S', 'M', 'D' and so on.

ASCII for 'S' is \x53, and the ASCII which I get is \xd3, which is exactly 128 more than 'S'.

This pattern follow for all the characters I get. If I get a hex valve which is more than 128, I can just substract 128 from the byte and I get the correct byte.

Actually, 128 is also biggest 8 bit integer (2^(8-1)).

If I run the simple algorithm that if byte is more than 128. subtract 128 and print it, I get

LSCI,MODEL325,LSA270H,1.8/1.1

I am not sure if the bug is in python or in the firmware of instrument. Any help would be appreciated.