RF-KLP-315 and PIC18f4550

I would like to use the tx/rx to connect 2 PIC18F4550 mcu’s together. I am not very farmilar with the RF-KLP-315 so forgive me if this is a dumb question but can just connect the RF-KLP-315 to a digital output/input to send and receive data, my own custom PWM protocol for example?

I use mplab and the microchip c18 compiler to program my pic firmware, do you have any examples that use c to control the RF-KLP-315?

Nathan from SparkFun said that I would need to “transmit a constant digital signal with at least 300bps.”

Can anyone give me any pointers on where to get started? Thanks!