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[...] the guy only had the transmitter.
Tether PortSometimes for diagnostic purposes, it may be useful to plug the transmitterdirectly into the Microcontroller, and bypass the need for the RF Receiver.This would help you determine, for instance, whether radio interference is atfault for your robot behaving strangely, or if some other factor is to blame.In order to use the tether feature, you will need to purchase a cable. Any telephonehandset extension cable will work (the coiled cable that goes from thehandset to the base of a corded phone, not the cable that goes from the phoneto the wall).
The tether port on the back of the transmitter has only four wires. From the bottom to the top they are: RF disable, Ground (battery minus), pulse width modulation out, and the fourth wire (at the top) is not connected. Shorting the RF disable pin to ground will turn off the RF output. I presume this is used to "disable" the VEX bot as its behavior is similar to turning off the transmitter manually. The pulse width modulation output requires a pull-up resistor to see the signal on an oscilloscope. If you don't know what a pull-up resistor does or how to set one up, don't mess with any of the transmitter or receiver stuff as you will likely fry something. There is no way to send info to the transmitter tether port and have it transmitted to the receiver module.