The following application note demonstrates the configuration of the ELPRO 645M-4 modem using the Modbus TCP to RTU conversion. This will allow serial devices to be connected to the RS232 on the terminal strip which can then be access via the TCPIP either locally or via the WAN. This guide does not show how to provision the Cellular PPP Connection; details of this can be found in the quick start guide for the 645M-4.