I have discrete serial codes for a BenQ PB7200 projector but would like to translate them IR. How do I do that? any ideas? DO I need any specail program or equipment?

there isa serial to IR converter, see www.ikonavs.com av control

i think there is a xantech device that goes serial to IR...

The initial question used "serial to IR" in the context of translating a signal published as serial into a form that could be transmitted by IR.

"Serial to IR" hardware would solve the opposite problem.

Most projector serial discrete codes have no IR equivalents. So the requested translation probably doesn't exist. That leaves the choice of an expensive hardware solution. But the hardware you need is "IR to serial" not "serial to IR":

You want a device that has documented IR signals it can receive and programmable serial signals it can send. Then you program that device to send the BenQ's documented signals and program your universal remote to send the "IR to Serial" device's documented IR signals. Then you can send a signal from the remote which will result in the intended control of the BenQ.

I expect the same companies mentioned above selling "serial to IR" also have models for "IR to serial".