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NI PXI-8461
NI PXI-8461

NI PXI-8423

Product Name: 4-Port PXI RS-485 / RS-422 Serial Communication Module

Product Description: The PXI-8423 is legacy PXI serial communication module for industrial multi-drop serial bus communication. It provides four independent software configurable serial ports for RS-485 and RS-422 bus.

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Description

Technical Specifications: Serial Ports: 4 independent ports Protocol: RS-485 / RS-422 Baud Rate: 50 bps to 1 Mbps Data Bits: 5 to 8 bits Stop Bits: 1, 1.5, 2 bits Parity: None, Odd, Even, Mark, Space Flow Control: Hardware RTS/CTS, DTR/DSR

Function Features: Per-port protocol selection. Hardware flow control. Built-in error detection for parity, framing and overrun error. Supports multi-drop bus connection, up to 31 nodes per bus. NI-Serial driver support.

Application Scenarios: Industrial automation serial communication, PLC interface test, sensor serial data acquisition, distributed field device communication, legacy equipment integration.

Material Composition: Front panel: aluminum alloy. PCB: multi-layer FR4 board. Serial transceivers with ESD protection. Front terminal connectors.

Structural Features: 3U single-slot PXI module. Isolated transceiver protection circuit. Each port independent signal circuit.

Working Principle: Serial transceivers convert TTL logic signal from PXI bus to differential RS-485/422 bus level. Differential transmission reduces common-mode noise over long cable. Driver handles data framing and error checking.

Installation Requirements: Install into standard 3U PXI chassis. Use twisted pair shielded cable for RS485 bus. Terminate bus at cable endpoints for high baud rate. Install NI-Serial driver.

Usage Notes: Add 120 Ω termination resistor for high-speed long cable. Keep bus cable away from power cables. Use ESD protection. Do not exceed maximum bus node count.

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