'SOS' Programming

This page describes a technique to change settings in receivers using just your transmitter.
Programming mode is invoked with an 'SOS' morse code with Ch5, and then changes are made to settings with Ch3.
This option was added to Rx6x receivers and Rx47 from v611-18 (May 2018).

1. Ch5 needs to be able to move between 'high' and 'low' positions. Ch5 is the Bind button on DelTang transmitters and it is suitable. Ch5 needs to idle high (button released).
2. Ch3 needs to be able to move between 'high', 'center' and 'low'. Ch3 is usually the Direction switch on DelTang transmitters. Tx's with a 3-position Direction switch (eg: Tx22) are suitable. 2-position switches are not suitable but can usually be replaced with the Tx22 parts. Ch3 needs to be centered for programming to start.
3. The led on the receiver needs to be visible or 'LED2' enabled on an external led.
4. The Tx must have previously been bound with the Rx and have normal control over the model.
5. The Selecta switch if available (eg: Tx22) must be in the correct position for the model.
6. You need to have found the Programming Table on the DelTang web site for the product in question (see below).
7. You must have v611-18 software or higher (see below).

1. Switch the Tx and Rx on. Wait for the Rx led to stay on solid. You should have normal control of the model.
2. Wait at least 5 seconds with Ch5 in the high (released) position. This is a duration that must exist prior to the next step.
3. Generate an 'SOS' morse code with Ch5 (...---...). Dots (...) will typically be a very quick press of the button and must be less than 0.7s in duration each. Dashes (---) must be greater than 0.7s and less than 5s each. 2s can be a reliable target time for dashes. The time between each dot/dash when the Ch5 button is released can be anything less than 5s. The sequence aborts if any press or release of the Ch5 button is longer than 5s; just go back to Step 2.
4. If the SOS pattern is recognised, the led will display a repeating single-flash if Ch3 is centered. If Ch3 is not centered, the led will flash very fast until it is centered. Programming cannot commence until Ch3 is centered. If the sequence is not recognised, the led will stay on solid; go back to Step 2.
5. Switch the Rx off at any time to abort.

* Ch5 is often used to invoke battery voltage flashes. From v611-18 when the SOS programming technique was introduced, battery voltage flashes are only triggered when the Ch5 button is pressed for 5s or longer.
* Rx62 also uses Ch5 for switching itself off. By default, this requires Ch5 to be pressed for 10s.
* Ch5 is also used for calibrating DelTang transmitter kits. This occurs when Ch5 is low for 20s or more.

Ch3 Programming
1. One programming change requires up to five choices to be made. These are called 'levels' and each has several options. You have to remember which level you are changing and the repeating led flashes display the current option for that level. You always start at Level 1. For example, the first choice is the Menu number. The first option (1-flash) is for changing 'H' outputs, the second (2-flash) is Menu 2 to change P outputs for servos etc. Refer to the Programming Table for your product to find the number of options and what they change. Each Level is in a separate column, 1 to 5 left to right.
2. To accept (= 'yes') the current number of flashes and move on to the next Level, Ch3 is moved to the 'high' position. On DelTang transmitters this is normally to the right/up/forward/clockwise position.
3. If you want to chose a different option in the same Level you say 'no' to the number currently being displayed and the flash count will increase by one and eventually scroll through all the options available. To not accept (= 'no') the current flash and increment by one in the same Level, move the Ch3 switch to the 'low' position (eg: left/down/reverse/anti-clock).
4. When you make a choice with Ch3 the led will flash rapidly while deflected and you then center Ch3 to see the new flash count. If you said 'yes' then you will have moved to the next programming level. If you said 'no' you will see the next option number in the same level.
5. The led should come on solid after you have said 'yes' to all Levels for this change. Changes are saved automatically. You often have to switch the Rx off and on to pick up the change. You can switch the Rx off at any time prior to the last 'yes' to abort/not save the changes.

* Where possible, the initial number of flashes shows the current setting. So to see current settings for a particular choice simply say 'yes' to all levels.
* This can also be used to verify the 'yes' direction of the Ch3 switch. Flashes always start with '1' for the H outputs menu. The first 'Yes' should move you on to Level 2 to allow you to choose the H output number. This will also always start at '1' for H1. So after you press the Ch3 switch the first time in the correct direction for 'yes' you should continue to see a 1-flash. If you are pressing the Ch3 switch in the direction representing 'no' then the Level 1 flash count will increment from 1-flash to 2-flash. Switch the Rx off to abort and try again pressing Ch3 in the 'other' direction.


Compatible receivers are listed below. The receiver board ID (eg: 60b) is machine printed on the PCB. The version of the software is hand-written on the largest black chip on the receiver. This must be '11/18' or higher (v611-18).

Version Marking Rx60c Rx61d Rx62b Rx65b Rx47a
611-x 11/x v611

Home Videos About Buy Email