I do not believe you can actually do this. The AB messaging instructions, even in Controllogix, are based upon comm protocols. For example, DF1 or DH485 (serial), DH+ (token ring), ETHIP / CPS4 (AB Encapsulated Ethernet.
Your Red Lion unit is talking Serial Comm (likely Telnet Terminal or a basic TTY) encapsulated in Ethernet.
The chances of them 'talking' to each other is slim to none I would imagine. What you may need to do is to poll the data from the PLC using an OPC package, and then write it back to the controller using a Telnet based interface.
It's do-able, but its a b******
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