Description
The NI NI-9871 is a 4-Port RS485/RS422 Serial Interface Module designed for National Instruments’ CompactRIO systems. It facilitates communication between your CompactRIO system and various devices using the RS485 or RS422 serial communication protocols.
Here’s a breakdown of its functionalities and how to find more information about it:
Functionality:
- The NI-9871 enables serial communication between your CompactRIO system and up to four RS485 or RS422 devices. These devices can include sensors, actuators, displays, or other controllers that use serial communication for data exchange.
- RS485 and RS422 are balanced serial communication protocols known for their:
- Multi-drop capability: Allows connecting multiple devices (up to 32 in RS485) to a single communication bus, reducing cabling complexity.
- Noise immunity: Offers better noise resistance compared to standard RS232, making it suitable for industrial environments with potential electrical noise.
Features:
- Four Independent Ports: Provides four independent RS485/RS422 ports for connecting to separate devices.
- Configurable Baud Rates: Supports a wide range of baud rates (typically from 14 bits per second to 921.6 kilobits per second), allowing you to adjust communication speed based on device requirements.
- Direct FPGA Access: The serial ports can be directly accessed by the CompactRIO’s Field-Programmable Gate Array (FPGA) for high-performance communication and control applications.
- Standard Configuration Options: Supports standard features like start/stop bits, parity checking, and handshake protocols for reliable serial communication.
