I've gotten my hands onto an INIT PidMobil4 next stop display (LED matrix) that was previously installed on a STM (Montréal, Québec, Canada) bus.
I have tried to get in touch with INIT to get data specifications and have tried sending all matter of IBIS telegrams using an IBIS converter, but have not been able to find which telegram(s) are used to display text on the sign.
Does anyone have any more information about these displays?