PXI-8432/4 4-Port Isolated RS232 PXI Interface
Земля PXI-8432/4 is a four-port isolated RS232 interface module designed for industrial communication and automated test systems. It combines high-speed serial operation with port-to-port and port-to-computer isolation.
The module supports transfer rates up to 1 Mbps and uses DMA communication to reduce host-processor utilization. Four independently configurable ports allow several electrically separated RS232 devices to be controlled from one PXI slot.
Key Features of the PXI-8432/4
- Four isolated RS232 serial ports
- Port-to-port isolation
- Port-to-computer isolation
- 2,000 V isolation architecture
- Maximum baud rate of 1 Mbps
- 128-byte transmit and receive FIFOs
- High-performance DMA transfers
- Four 10-position modular connectors
- Standard COM-port operation
- NI-Serial and NI-VISA compatibility
- Designed for industrial and automated test systems
PXI-8432/4 Technical Specifications
| Product Model | PXI-8432/4 |
|---|---|
| Part Number | 779538-01 |
| Serial Standard | RS232 |
| Number of Ports | 4 |
| Изоляция | Port-to-port and port-to-host |
| Maximum Baud Rate | 1 Mbps |
| FIFO Size | 128 байт |
| Front Connectors | 4 × 10-position modular jacks |
| Typical +5 V Current | Approximately 925 mA |
| Maximum +5 V Current | Approximately 2 A |
| Operating Temperature | 0°C to 55°C |
| Storage Temperature | -20°C to 70°C |
| Dimensions | 100 mm × 160 mm, 3U |
| Weight | Approximately 147 g |
| Bus Compatibility | PXI hybrid-compatible |
PXI-8432/4 Part Number and Accessories
| Item | Part Number | Описание |
|---|---|---|
| PXI-8432/4 | 779538-01 | Four-port isolated RS232 PXI interface |
| 10P10C-to-DB9 Cable | Verify configuration when ordering | Adapter cable for connecting one modular port to a DB9 RS232 device |
Four compatible adapter cables may be required to expose all serial ports as DB9 connections. Verify cable gender and DTE/DCE wiring before purchase.
Four Isolated Communication Channels
Each channel forms a separate communication interface. Electrical noise or ground offset on one port is less likely to affect the host or another connected serial device.
This is valuable when the PXI system communicates with equipment located in different cabinets, test cells or power domains.
Ground-Loop Reduction
Nonisolated RS232 systems connect device grounds through the communication cable. When the devices are referenced to different grounds, current can flow through the serial connection and cause errors or equipment damage.
The PXI-8432/4 isolation architecture helps interrupt this path. Correct grounding, shielding and safety design are still required throughout the complete installation.
High-Speed RS232 Operation
Each port supports rates up to 1 Mbps. Actual reliable distance decreases as the baud rate, cable capacitance and electromagnetic interference increase.
Validate the selected cable and baud rate under real operating conditions rather than relying only on a short laboratory connection.
Typical PXI-8432/4 Applications
- Multi-device isolated RS232 control
- Industrial production equipment
- Environmental chamber communication
- Remote instrument control
- Motor-controller configuration
- PLC and embedded-system communication
- Ground-loop-sensitive test systems
- Automotive and aerospace test equipment
- Laboratory automation
NI-Serial Software Support
NI-Serial detects the module and creates four standard COM resources. Each channel can be independently configured for baud rate, parity, stop bits, data bits and flow control.
NI-VISA can be used when a common instrument-control API is preferred across serial, USB, Ethernet and GPIB resources.
PXI-8432/4 Troubleshooting
The module uses excessive chassis power
The isolated four-port architecture can draw as much as approximately 2 A from the +5 V rail. Confirm that the chassis slot and total system power budget are adequate.
A modular-to-DB9 cable does not work
Confirm that the cable was designed for the NI serial pinout. A mechanically compatible modular cable may not have the correct internal wiring.
One port repeatedly disconnects
Check the connected device, cable shielding, communication parameters and ground-potential difference. Compare operation with another port to isolate the problem.
Data arrives with incorrect characters
Verify that both ends use exactly the same baud rate, parity, character length and stop-bit configuration.
PXI-8432/4 vs PXI-8432/2
| Функция | PXI-8432/4 | PXI-8432/2 |
|---|---|---|
| RS232 Ports | 4 | 2 |
| Connectors | Four modular jacks | Two DB9 male connectors |
| Изоляция | Да | Да |
| Best Suited For | Higher isolated port density | Direct DB9 access |
Recommended Related Products
- PXI-8432/2 Isolated RS232 Interface
- PXI-8430/4 Nonisolated RS232 Interface
- PXI-8433/4 Isolated RS485/RS422 Interface
- PXI-8431/4 RS485/RS422 Interface
- View More NI PXI Modules
Frequently Asked Questions
How many ports does the PXI-8432/4 provide?
It provides four independent isolated RS232 ports.
Does it use DB9 connectors?
It uses four 10-position modular connectors. Compatible adapter cables can provide DB9 connections.
What is the maximum baud rate?
The maximum supported baud rate is 1 Mbps.
When should I select an isolated serial module?
Select it when the connected devices have different ground potentials or when industrial noise could interfere with communication.
What is the PXI-8432/4 part number?
The NI ordering part number is 779538-01.
Request a Quote for the PXI-8432/4
Contact us for availability and pricing for the PXI-8432/4 4-Port Isolated RS232 Interface. We can also provide help selecting compatible DB9 cables and alternative serial modules.
