The 136188-02 is an Ethernet/RS232 Modbus I/O Module developed by Bently Nevada, including the Firmware Upgrade Kit (126M4118-01).It is part of the 3500/92 Communication Gateway module, which provides extensive seriaI(RS232/RS422/RS485) and Ethernet TCP/IP communication capabilities.This module facilitates the integration of all rack monitoring values and statuses with process control and other automation systems.It also supports Ethernet communication with data acquisition software and the 3500 Rack Configuration Software.