Hex command width channel_set

I use C#, and send command with xmlrpc
like this:

but the “value” just only be “string”, and I must sent hex command like 0x01, 0x00, 0x02…, how can i solve this problem?

As we know, the RS232 communication works in ASCII. So, for that you can send the ASCII characters instead of the HEX value. So, that equivalent ASCII character to te HEX value can be sent to XBee serial terminal and it can be programmatically converted to hex values.