Yeah, it seems you can't do that with the standard cia402 component.
It only support csp mode(1) and possibly csv(0), and what I read your device is working in asynchronous velocity mode(2) and that's not supported at least fully.
It's the controlword, obviously, that starts and stops the motor.
Normally the cia402 component has full control over the controlword and that must be now manipulated by setting on and off bit 4-6 (7F vs 0F) for start stop
There is the option to modify the cia402 component, but maybe "easier" to manipulate the controlword
between cia402 component and lcec.
Break the connection between cia402 and lcec controlword and insert something like
if op-enabled (controlword bit 0-3 set) and start pin (new pin)
set controlword bit 4-6 true
else
set controlword bit 4-6 false
with hal logic. The resulting controlword connects to lcec.
In addition to that, don't connect any of the cia402 commanded or feedback pins, do the speed setting and speed feedback outside the cia402 component. Basically, the cia402 component will bring the device to op-enabled, that's all. You set the op-mode and all speed settings directly to lcec.
