# Connecting to an Industrial Network

This section details procedures for establishing the communications link between the Catalyst RTU and an industrial network.

The Catalyst currently supports the Modbus, ModbusTCP or EtherNet/IP protocols. There is also a simple ASCII protocol, called Local Data Logging protocol (LDL). This is used only for connections with logging terminals and printers.

The general steps for connecting the RTU to an industrial network are as follows:

- Determine which network interfaces are needed for the application. Consult the equipment vendors, or contact Customer Support for advice.
- Prepare the external network connection. The Industrial Networks section describes usage and configuration for interfacing devices. Follow the vendor's procedures for installation and configuration.
- Connect the correct cable between the RTU and the network. Once connected, it should be safe to power up all equipment.
- Configure your RTU, preferably with Alarmware™.
- Use the procedures in the Testing, Troubleshooting & Diagnostics subsection.