Data Sheet

Pololu 4-Channel RC Servo Multiplexer (Assembled),
labeled pinout.
For the Pololu 4-Channel RC Servo Multiplexer, the learning mode jumper consists of a pair of
exposed pads on the component side of the board. An alternate learning mode jumper is available on
the other side of the board and is labeled “LEARN”; you can use whichever jumper is more convenient.
To connect the two pads, you can use a wire, screwdriver, or some other conductive tool.
9.1. General Configuration Procedure
This is the general procedure for configuring the device. To follow these instructions, you will need to
know how to connect and disconnect the learning mode jumper, as described in Section 9.
1. Get the device into learning mode. In order to do this, power off the device, connect the
learning mode jumper, and then power it on. After it is powered on, disconnect the learning
mode jumper. At this point, you will see the indicator LED fading in and out with a period of
1 second. Your device is now in learning mode, and will be until you next turn off the power.
In learning mode, it will not turn on the relay. If you want to abort learning mode, you can
power off the device at this point and none of your settings will change.
2. Tap the learning mode jumper (connect it and then disconnect it). This restores all of the
settings in the device to their default values; the threshold will be 1696 μs and inversion will
be disabled. The indicator LED should be blinking a different pattern now. If you want to use
the default settings and exit learning mode, you can power off the device at this point and
skip the instructions below.
Pololu RC Switch User’s Guide © 2001–2017 Pololu Corporation
9. Configuring Your RC Switch Page 43 of 45