[PyQt] Sending 4 bytes Hex data over serial in PyQt

[gratna]

Hi,

I would like to send 4 Bytes of Hex data over serial to a microcontroller which are being received from GUI in PyQt5.
For example, consider the first two bytes received as characters 'a' and 'b' while the remaining two bytes as integers and I would like to send all the 4 bytes as Hex values over serial. Kindly help.

firstByte = 'a'
secondByte = 'b'
thirdByte = 100
fourthByte = 120


Thanks in advance,
gratna