I am trying to replace the lamp and ballast assembly in an Acer P1500 DLP projector. The ballast is an OSRAM PT-VIP-05 COMPACT. It features a UART control scheme that allows the motherboard to query and set various parameters intelligently. I've been able to find the datasheets for both the ballast module itself as well as the specific protocol it implements via the UART. The issue I'm having is that I can't quite figure out how to "reverse" the weird way that the Tx and Rx lines are sort of split for lack of a better explanation.
This is the schematic, per the OSRAM datasheet:
I need to replace the left hand side of the schematic with an Arduino or similar, the code and wiring and such I can absolutely handle. What is giving me trouble is correctly getting the Tx and Rx lines to neatly convert to the "standard" 3-pin UART interface we all know and love (GND / Tx / Rx).
Can anyone help me make sense of this?
Those pages reference the datasheets for the OSRAM Standardized UART Protocol as well as the OSRAM 5-Pin Interface, both of which I've uploaded in case they're helpful to anyone who needs them or is willing to help.