Dynamixel servo control without extra library

[constructionworker]

I am using MX-106 with U2D2 converter.
In addition to the example here, I am trying to read current speed,present position .vb engine information.

and I made an add-on to the code as below.
If I want to read the "present position" information in addition to the "goal position" information and if I print the commands, the "present position" information can be read.
Or, if I want to read the positioning "present speed" information in addition to the "goal position" information and if I print the commands, the present speed information can be read.
But when I try to send 3 commands at the same time, the serial port is occupied and the information cannot be read.

Does anyone know how to solve this?

Every opinion given is worthy of respect.

[constructionworker]

My main problem right now is that I cannot read multi-item information from a Dynamixel servo motor. I'm sure the problem is in the serial communication method. Because in its test application (DYNAMIXEL Wizard 2.0) it displays all the information at the same time.

do you have any idea about this?