GE 90/70 to 90/30 coms

I am looking for a solution to make my GE 90/70 plc communicant direct to my GE 90/30 plc. Do i need a Genius bus card for my 90/70? or is there as easier way to preform this task?

You could do it with a Genius module in each PLC. You could do it with an Ethernet module in each PLC. You could do it with a serial communications module in one PLC. Depending which CPU you have, you might be able to establish serial communications between the two PLCs without the need for a serial communications module.