ANT Forum

In AN14, section 5.3, the third step of sending a reverse message back to the master is:

"3. Send the extended message, appending
the channel ID of the destination master
(configured in step 2) to the data."

I believe this is incorrect.

Instead of sending an extended message to ANT, it works fine to send a normal message on the channel used in steps 1 and 2. After all, the channel configuration is already done for that channel, with the appropriate (device_number, device_type, transmission_type) set.

I ran into this in nrf51422 development, as the nrf51422 SDK doens't include a function to send any "extended message" to the Ant softdevice.

Perhaps the AN14 documentation could be amended to clarify this.
     

Hello Mark,

Thanks for pointing out the inconsistency in the documentation. There are two ways of sending messages in the reverse direction in scanning mode:

1) Send an extended message with the channel ID field set to match the ID of the intended destination

2) Set up the channel ID of a channel to match the ID of the intended destination and send a standard message

Since option #1 is not available for the nRF51, you should be fine using option #2.