How to send Serial Data to multiple devices.

Hello,

Here is what we want to do :
We have 192 devices that using PIC16f628A. Each device has own ID. Each device controls a stepper motor driver.

All devices is connected to Espruino Board with a serial cable. I mean it is a 1-n connection. Espruino TX port is 1 and there is 192 RX port connected to this Espruino TX port.

We have this kind of sytax;
START-(15,25,35)(5)-END
START-(22,23,23)(15)-END

This syntax means that ;
Devices with the ID of 15,25, and 35 will run stepper motor 5 times.
Devices with the ID of 22,23, and 23 will run stepper motor 15 times.

My aim is sending data to all devices at the same time.

What do you think? Is it a good way to connect 192 devices to a single TX port? What kind of problem will I have?

Thanks for your ideas.