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Performance on LabVIEW Real-Time
NI-Serial users on LabVIEW Real-Time have control over whether
secondary interrupt handling is enabled. When secondary interrupt
handling is enabled, I/O is processed at a priority lower than time-critical.
Using secondary interrupt handling reduces jitter for time-critical loops
and makes serial hardware interrupts more deterministic. However, it
may also reduce I/O performance and can increase the possibility of
overflowing the RX FIFO buffer. Secondary interrupt handling is a setting
at the system-wide level and is enabled by default.
To enable or disable this feature, complete the following steps:
1. Copy to your host the
niserial.dbs
file in the
/ni-rt/system
directory
on the RT target.
2. In the
niserial.dbs
file, find the entry
SecondaryInterrupts
and
modify it accordingly:
To enable secondary interrupt handling, set
SecondaryInterrupts
to 1.
To disable secondary interrupt handling, set
SecondaryInterrupts
to 0.
3. Download the updated
niserial.dbs
file to the target, overwriting the
existing file in the
/ni-rt/system
directory.
4. Reboot your RT target.
Summary of Contents for ENET-232 Series
Page 1: ......
Page 5: ...Using Help Conventions Navigating Help Searching Help Printing Help File Topics ...
Page 21: ...Serial Hardware Overview PCI Kits PXI Kits USB Kits ENET Kits ExpressCard Kits PCMCIA Kits ...
Page 24: ...PCI 485I RS 485 two port isolated RS 485 four port isolated ...
Page 27: ...PXI 8423 RS 485 two port isolated RS 485 four port isolated ...
Page 63: ...Save Pending Changes To save your changes to this item click Save ...
Page 98: ...0 LPVOID l_SerialInterface sizeof l_SerialInterface LPDWORD l_ByteCount NULL ...
Page 127: ...2 PORT LEDs USB Serial Hardware LEDs ...
Page 139: ...Connecting the Cables to a Four Port PXI Serial Board ...
Page 141: ...67 58 50 41 33 24 16 7 TXD 9 RI 9 ...
Page 167: ......
Page 169: ......
Page 171: ......
Page 181: ...How many serial ports can I have on my machine You can have up to 256 serial ports ...
Page 201: ...Glossary Prefixes Symbols A B C D E F G H I K L M P R S T U V ...
Page 203: ...Symbols degrees ohms percent ...
Page 204: ...A A amperes ANSI American National Standards Institute ...
Page 205: ...B b bits B bytes baud bits per second bps bits per second ...
Page 208: ...E EIA Electronic Industries Association EMI electromagnetic interference ENET Ethernet ...
Page 209: ...F FCC Federal Communications Commission FIFO First In First Out ft feet ...
Page 210: ...G G ground ...
Page 211: ...H HSI handshake input HSO handshake output Hz Hertz ...
Page 213: ...K Kbaud kilobits per second ...
Page 214: ...L LED light emitting diode ...
Page 215: ...M m meters MB megabyte ...
Page 216: ...P PC personal computer PCI Peripheral Components Interconnect ...
Page 218: ...S s seconds SCSI Small Computer Systems Interface ...
Page 220: ...U UART Universal Asynchronous Receiver Transmitter ...
Page 221: ...V V volts VDC volts direct current VXI VME eXtensions for Instrumentation ...