Question

How am I to express variable as hex to send like-

a='00'
write("\x#{a}") => 0x00

Trying to include received string variable into command string of raw data and passed to com port like –

cmd="\x45\x#{a}\x01"
Send(cmd)

In Ruby

Thanks

Answer 1

The String#to_i function takes a base argument, which default to ten – but you can pass in sixteen instead. That’ll get you the number you want as a number, rather than a string. From there, you can use the Integer#chr function to get the value you want – a string containing the character with the binary value represented by the original string.