AOI for Modbus rs-485 on L62 serial port?

[tlf30]

Does anyone know of an AOI using the user ASCII protocol select on the L6x controllers that will talk Modbus RTU using RS-485?

Thanks,
Trevor

EDIT: Or a dirt cheap used prosoft MVI56-MCM module? This is for my bench at home. I'm building some wireless modbus level indicators for my heating oil tanks.

 

[tlf30]

After some research, I found that the serial port only does RS-232. Which surprised me because I always thought DH-485 was done using RS-485. I guess I need a converter. I also found that Rockwell has a AOI for serial Modbus RTU, it was hidden deep in the knowledge base, my previous searches failed to find it.