I have 2 Dynamixel MX28-AR motors controlled by a Teensy 4.1 with RS485 communication to the servos over the 2.0 protocol. Servos are powered from a 12V wall adapter. Reading and writing individually works fine, as does sync write operations. Whenever I try to syn read though, the servos do not send a response. I have reproduced the issue with the servos connected to a computer with the U2D2 adapter and the Dynamixel Wizard software, so that’s what I’ll show here.
In the dynamixel wizard I can connect to the daisy-chained servos fine (1Mbps baud). In the “Packet” toolbox, you can see that reading from both servos (IDs 1 and 2) is fine, but there is no response to my fast sync read command.
Here is the current configuration (same for both):
Any thoughts on why fast sync read does not respond? Is this supported in these servos or are there some settings I have to change to allow for fast sync reads?