How far can you reliably transmit and receive data at a specified data rate? This reference design provides a simulation model that helps you assess the feasibility of implementing RS485 communication at a given data rate, cable length, and loading for a specific cable
The communication bus is a key component of many applications. In elevator systems a bus connects the buttons inside the elevator car to the elevator main controller. Existing systems rely on proprietary bus solutions which have served well for many years. However, as new features are added, complexity grows and customers want to a standard interface such as CAN and RS-485 that can provide more throughput and can interface with other networks. Additionally, customers want a wired solution that can simplify installation and reduce cabling costs.
Before selecting the final solution, customers must build a representative network for testing. This step can be very time-consuming and impractical for a network that consists of hundreds of nodes and varying segment lengths. Customers need an easy mechanism to narrow down the list of possible solutions before taking this time-consuming step.
How far and how fast can you go with RS-485?
This reference design establishes a simulation model for implementing RS-485 communication over power cabling. This simulation model can be used to assess the feasibility of implementing RS485 communication at a given data rate, cable length, and loading for a specific cable before taking the time-consuming step of building a representative network. A procedure is given for developing a cable model for any given cable and replacing the cable model in the simulation.
- Simulation model demonstrates feasibility of 64 kbps data rate with cable length up to 1000 feet and a total of 128 nodes
- Sanity-checked against real cable measurements
- Establishes procedure for developing cable model for further simulations
• Elevator Calling Buttons Operating Panel
• Elevator Main Control Panel
• Electronic Door Locks
• HVAC System Controller
Click here for more details on the reference design.