Binding Connection Explained

In order to accomplish a bind between the Spektrum receiver and transmitter, the signal pin on the BATTERY slot in the receiver must become grounded (connected to the Negative power lead).

No other servo slot in the receiver will allow you to accomplish the bind.

In order to accomplish this grounding of the binding signal pin, you must be using a three-wire battery switch harness. The three wires are the positive, negative, and signal leads. The Spektrum binding plug is a simple shorting plug, and merely places a [jumper] wire across the signal pin and ground (negative) pin.

A two-wire switch and wire harness will only connect positive and negative…but not the signal, and consequently will not allow binding to take place.

If your installation is employing a two-wire switch and wiring harness, as may be the case with some lithium battery and regulator systems, you [will need to] temporarily remove that two–wire harness from the system by unplugging it from the receiver battery slot. [You can plug your two wire harness into any unused channel in the receiver for this binding process, but remember you will need to RECONNECT it to the "Battery" connector in the receiver AFTER binding- Ed.]

Plug in the three-wire switch, wiring harness and battery that came with the radio and proceed with the binding as per the instruction manual. After the binding is successful, you may remove the Spektrum three-wire switch and harness and reinstall your two-wire system.

Keep the three-wire switch and harness handy for any future binding that may be required.

The Spektrum receiver does not care at all about what sort of battery technology is delivering the power:… Lithium, NiMh, NiCd, A123, etc etc, but it absolutely demands that you accomplish the grounding of the binding pin in order to achieve a bind. [Remember the maximum voltage for the AR7000 is +9volts - Ed]

Capt Jim (RCU Username)

[Editor comment - Capt Jim graciously shared his experience, and I added a couple of comments for clarification.  His explanation is perfect - "Binding" requires that signal pin to be connected to the negative battery lead;  how that happens is almost irrelevant, but it MUST be the signal pin from the "Battery" connector slot in the AR7000!! ]