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NI Serial Hardware and Software Documentation
How many serial ports can I have on my machine?
NI Serial Hardware and Software
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How many serial ports can I have on my machine?
You can have up to 256 serial ports.
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Table of contents
Serial Hardware and Software Help
About this Help File
Related Documentation
Using Help
Conventions
Navigating Help
Searching Help
Printing Help File Topics
Introduction
How to Use this Help File
What You Need to Get Started
Optional Equipment
Serial Hardware Overview
PCI Kits
PXI Kits
USB Kits
ENET Kits
ExpressCard Kits
PCMCIA Kits
NI-Serial Software Overview
Time-Saving Development Tools
NI Serial Software Installation
Install the Hardware
PCI Hardware Installation
PXI Hardware Installation
USB Hardware Installation
ENET Hardware Installation
ExpressCard Hardware Installation
PCMCIA Hardware Installation
Measurement & Automation Explorer (MAX)
Overview
Launching MAX
Adding a Serial ENET Interface
Verify Installation and Troubleshoot NI-Serial Problems
Delete a Serial Interface
View NI-Serial Software Version
Monitor, Record, and Display NI-VISA API Calls
System Report Generation
View or Change Serial Port Settings
Port Settings
Advanced Settings
Save Pending Changes
Discard Pending Changes
Restore Defaults
Import/Export a Configuration File
NI-Serial Communicator
Recover Unused COM Numbers
Additional Help and Resources
NI-Serial Online Help
National Instruments Serial Web Site
Serial ENET Configuration
Viewing Network Settings
Configuring Network Settings
Using the CFG RESET Switch
Verifying the Hostname
Using DHCP
Using Static IP Parameters
Updating Firmware
Using Your Serial Hardware
General Programming Requirements
Baud Rates
Performance on LabVIEW Real-Time
Advanced Features
FIFO Buffers
Retrieving the Serial Interface Type (RS-232 or RS-485)
RS-485 Transceiver Control
Setting the Mode in Windows
Setting the Mode in LabVIEW Real-Time
Bias Resistors
USB-485 Programmatically Controlled Bias Resistors
Setting the USB-485 Programmatically Controlled Bias Resistor Mode
Retrieving the RS-232 Transceiver State
USB-232 Tranceiver Control
Setting the RS-232 Tranceiver Mode
Setting Ring Indicate (RI) and Data Carrier Detect (DCD)
Status LEDs
USB LED Descriptions
ENET LED Descriptions
ENET PWR/RDY LED Signaling
Connector Descriptions
Connecting Cables
Connecting Two-Wire Devices
DB-9 Connector
Modular Jack Connector
DB-25 Connector
68-Pin Connector
100-Pin Connector
Serial Port Information
RS-232
RS-422
RS-485
Serial Communication Issues
Duplex Architectures
Full Duplex
Half Duplex
RS-485 Termination
Bias Resistors
RS-232 DTE versus DCE
Uninstalling the Hardware and Software
Delete a Serial Interface
Uninstall Software from Your LabVIEW RT Target
Uninstall the Windows Software
Troubleshooting and Frequently Asked Questions
Verify Installation and Troubleshoot NI-Serial Problems
Frequently Asked Questions
How do I force Windows to detect my PCI, PXI, or PCMCIA hardware?
How do I force Windows to detect my USB hardware?
How do I force Windows to detect my ExpressCard hardware?
How can I determine which type of serial hardware I have installed?
Why does my PCI/PXI serial card display the wrong serial number?
How can I determine which version of the NI-Serial software I have installed?
How do I troubleshoot problems?
How can I determine whether my hardware and software are installed properly?
How can I repair my NI-Serial software?
How can I determine which port is associated with COMx?
How can I change the COM numbers of my National Instruments serial ports?
Why can't I make changes to my settings in MAX on Windows Vista?
Why does my hardware keep reappearing after I delete it on Windows Vista?
How many serial ports can I have on my machine?
How many interrupts are required for my serial interface?
How do I resolve serial USB power conflicts?
What is the difference between USB 2.0 and USB 1.1, and can I use the USB serial hardware in USB 2.0 networks?
Why isn't the Auto232 transceiver mode on my USB-232 working?
Why am I seeing poor performance on Windows XP when I use multiple USB serial interfaces?
Why did my USB serial ports enumerate backward?
How do I access my serial ENET interface using the hostname?
How do I communicate with serial ENET interfaces located on other subnets?
Why does the NI Ethernet Device Configuration utility list my serial ENET interface as *BUSY* when I know my network uses DHCP?
Why doesn't my serial ENET interface show up in the NI Ethernet Device Configuration utility?
Why did my application work with a plug-in interface but times out with a serial ENET interface?
What is the relationship between bits per second, throughput, and bus utilization?
What happens to data sent to a closed serial port?
Why do loopback tests of large data transfers sometimes have problems?
Does the serial hardware have built-in support for protocols such as SDLC and ModBus?
How do I use 9 data bit framing?
Can I use NI-Serial hardware with a non-Windows platform?
Can I use USB serial hardware, Ethernet serial hardware, ExpressCard serial hardware, and plug-in serial hardware in the same computer at the same time?
Glossary
Important Information
Warranty
Copyright
Trademarks
Patents
Warning Regarding the Use of NI Products
Compliance
Technical Support and Professional Services
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