I am trying to find a 2.1 version AS-I to Modbus gateway that will support two networks with 167kbd. Is there such a thing?

The AS-i network is fixed at 167kB, all masters and slaves run at this baud rate.
We have within our membership suppliers able to offer such a Gateway, this will be forwarded for them to contact you.

We can support 3 AS-interface gateways on our controllers. Offering connectivity to a large number of the major fieldbus protocols. MODBUS/TCP/IP is supported directly, RS232 or RS485 TP Modbus would require a comms module and code on the controller.