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Originally Posted by Joe Johnson
Does the programming port on the VEX use RS-232 voltage levels (<-5V = 1, >5V = 0) or TTL voltage levels (<1.4V = 1, >1.4V=0)?
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programming port is ttl. programming dongle, however, has level shifter in it and since you need one anyway to program the controller to listen to the serial port, there's no point in not using it with an rs-232 level radio if that's what you've got. otherwise a ttl level radio could be used on either the programming port or the rx and tx connectors up top.