Guizhou Yuanmiao Automation Equipment Co., Ltd.: 1Yr

Anshun, Guizhou, China; Main products: ABB Triconex Foxboro LAM, Bentley Motorola Schneider, Kollmorgen HIMA ALSTOM, Reliance GE HONEYWELL NI、ICS

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Home > Products > National Instruments > NI PXI-8423 Serial Communication Module

NI PXI-8423 Serial Communication Module

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Product Details

Material	Other, Global universal model	Condition	Other, Global universal model
Task	Other, Global universal model	Mathematical Model	Other, Global universal model
Signal	Other, Global universal model	Customized	Non-Customized
Structure	Other, Global universal model	Temperature	0℃~55℃
Humidity	5%~95% (non-condensing)

Product Description

NI PXI-8423I. Product Positioning and Core Functions

The NI PXI-8423 is a high-performance serial communication module based on the PXI bus, specifically designed for automated testing, industrial control, and instrument integration scenarios requiring high-speed and reliable serial data transmission. Its core features include:

Multi-Channel Serial Integration: Supports 2 independent RS-232/422/485 serial channels, enabling simultaneous communication with multiple devices and compatibility with various industrial protocols.
High-Speed Data Transmission: The maximum baud rate reaches 115,200 bps (RS-232) or 1 Mbps (RS-422/485) per channel, meeting real-time data interaction requirements.
Flexible Protocol Support: Hardware-level compatibility with RS-232/422/485 electrical standards, and software-level support for custom protocols (e.g., Modbus, SCPI, custom instruction sets).
Reliable Hardware Design: Integrated overvoltage protection, ESD shielding, and isolation circuits (RS-422/485 channels), suitable for anti-interference scenarios in industrial environments.

II. Hardware Specifications and Technical Parameters

Parameter Category	Specific Indicators
Channels	2 independent serial ports (Channel 0 and Channel 1)
Electrical Standards	- RS-232: ±12 V level, maximum transmission distance 15 m - RS-422/485: Differential signals, maximum transmission distance 1,200 m
Baud Rate Range	- RS-232: 50 bps ~ 115.2 kbps - RS-422/485: 50 bps ~ 1 Mbps
Data Bits	5/6/7/8 bits (configurable)
Stop Bits	1/2 bits (configurable)
Parity Modes	No parity, odd parity, even parity, mark parity, space parity
Flow Control	- Hardware: RTS/CTS (RS-232), DTR/DSR - Software: XON/XOFF
I/O Protection	RS-422/485 channels support ±15 kV ESD protection, ±30 V overvoltage protection
Isolation	RS-422/485 channels support 2500 V rms electrical isolation; RS-232 channels non-isolated
PXI Bus Interface	PXI 2.2 (32-bit/33 MHz PCI), maximum data transfer rate 132 MB/s
Operating Environment	Temperature: 0℃~55℃, Humidity: 5%~95% (non-condensing)

III. Typical Application Scenarios1. Industrial Equipment Communication and Monitoring

Scenario: Multi-device networking of PLCs with sensors/actuators, such as data acquisition from temperature sensor arrays on production lines.
Implementation: Connect 32 Modbus slave stations (e.g., temperature transmitters) via RS-485 bus, leverage the dual-channel parallel communication of NI PXI-8423 to read temperature data in real time and upload to the master control system, with communication delay <10 ms.

2. Instrument Integration Testing

Scenario: Automated test process control for RF instruments (e.g., signal generators, spectrum analyzers).
Implementation: Send SCPI commands via RS-232 interface to control instrument parameters (e.g., frequency, power settings), while receiving test result data. Collaborate with LabVIEW to implement fully automated test sequences, improving test efficiency by 50%.

3. Embedded System Debugging and Data Interaction

Scenario: Ground station debugging for UAV flight control systems, requiring real-time reception of flight data and transmission of control commands.
Implementation: Use RS-422 channel to communicate with the flight control board at 500 kbps, transmitting attitude data (angular velocity, acceleration) and control commands (servo parameters), supporting hot-swapping and real-time error checking.

IV. Software Support and Programming Interfaces1. Drivers and Development Tools

NI-VISA Driver: Provides unified APIs for serial configuration, data read/write, and error handling, compatible with development environments like LabVIEW, C, Python, and MATLAB.
LabVIEW Serial Module: Graphical programming interface supporting drag-and-drop serial communication flow design, with built-in data flow monitoring and protocol analysis tools.
NI-Serial Toolkit: Offers advanced functions (e.g., custom protocol parsing, multi-channel synchronization) and supports real-time operating system (NI RT) deployment.

2. LabVIEW Programming Example (Pseudocode)

plaintext
// Dual-channel serial communication (RS-485 master mode) [Initialization configuration] → Configure Channel 0 as RS-485, baud rate 500 kbps, 8 data bits, 1 stop bit, no parity, enable hardware flow control   → Configure Channel 1 as RS-422, baud rate 1 Mbps, same parameters as above, enable isolation protection   // Send and receive data (Modbus RTU protocol) → Channel 0 sends Modbus read command: [Slave address 01][Function code 03][Start register 0001][Register count 0010][CRC check]   → Wait for response (timeout 500 ms), read data frame and parse temperature values (registers 0001-0010 correspond to 10 temperature sensors)   → Channel 1 sends real-time control commands to actuators while receiving device status feedback (e.g., motor speed, valve opening)   // Error handling mechanism   → When a parity error (CRC mismatch) is detected, automatically resend the command (up to 3 times)   → Trigger an interrupt when the serial port is disconnected, switching to the backup channel (e.g., enable Channel 1 for redundant communication if Channel 0 fails)

V. System Integration and Expansion Solutions1. Hardware Matching Recommendations

Serial Cables and Adapters:

RS-485 bus: Use shielded twisted-pair cables (AWG 24) with 120 Ω terminal matching resistors.
RS-232 connection: Straight or cross cables, supporting DB9 male/female adapters.

Multi-Device Networking: Pair with the NI PXI-8430 serial expansion module (4 channels) to achieve multi-serial synchronization via the PXI trigger bus, supporting up to 16 channels for parallel communication.
Industrial Environment Adaptation: Connect external isolation repeaters (e.g., ADAM-4520) to extend RS-485 bus distance to 2 km, or use optoelectronic converters for electrical isolation.

2. Performance Optimization Strategies

Real-Time Optimization: Deploy programs in the NI RT system to reduce Windows system scheduling latency (typical response time <500 μs).
Anti-Interference Design:

Keep cables away from strong electromagnetic sources (e.g., motors, frequency converters), and ground the RS-485 bus at a single point.
Enable hardware flow control (RTS/CTS) to avoid data congestion and reduce packet loss rate (typical <0.01%).

VI. Comparison with Similar Products

Model	NI PXI-8423	NI PXI-8430	NI PXI-8512 (USB to Serial)
Channels	2 channels	4 channels	2 channels (USB interface)
Maximum Baud Rate	1 Mbps (RS-422/485)	1 Mbps (RS-422/485)	230.4 kbps (RS-232)
Isolation	RS-422/485 channels isolated	RS-422/485 channels isolated	Non-isolated
Core Advantages	Dual-serial high-speed synchronization, industrial-grade protection	Multi-channel expansion, cost-effective	Strong portability, suitable for temporary debugging
Application Scenarios	Medium-scale industrial communication, instrument integration	Multi-device networking, automated testing	Laboratory debugging, portable devices

Company Profile

Guizhou Yuanmiao Automation Equipment Co., Ltd.

Main products: Covering globally renowned brands: Bently Nevada, Triconex, Woodward, Foxboro, Westinghouse, Reliance, Schneider Modicon, ABB, AB (Allen-Bradley), Motorola, GE Fanuc, Yaskawa, Bosch Rexroth Rexroth, ACSO, YOKOGAWA, Rexroth, NI, ICS Triplex, Kollmorgen, Mitsubishi, MOOG, Emerson, B&R B&r, SST, ALSTOM, KUKA EPRO, LAM HIMA dark Horse, HONEYWELL, prosoft, AMAT, SIEMENS, etc. The product categories include: DCS system accessories, robot system spare parts, large servo system spare parts, etc., which are widely used in power, chemical, metallurgy, intelligent manufacturing and other fields.

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Guizhou Yuanmiao Automation Equipment Co., Ltd.: Contact nameyezi
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Product Categories

ABB	Bently Nevada	TRICONEX	GE
ICS Triplex	HIMA	MOTOROLA	WOODWARD
HONEYWELL	Foxboro	Schneider Modicon	YOKOGAWA
EPRO	MOOG	Westinghouse	Reliance
Emerson	B&R	ALSTOM	LAM
KONGSBERG	FANUC	National Instruments	Kollmorgen
Other Brands	Rexroth	PROSOFT	Vibro-meter
Allen-Bradley	ZYGO

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NI PXI-8423 Serial Communication Module

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