Model: PXI-8423
Type :RS-485 Serial interface
The port; 2
I/O connector: DB-9 male
The maximum transmission rate is 460.8kb/SEC
Dimensions: 6.3 x 3.9 inches
Maximum cable length 4,000 feet
National Instruments PXI-8423 RS-485 interface

The National Instruments PXI-8423 (Part number: 777737-02) features a 64B FIFO, 460.8 (kb/s) transfer rate and optical isolation, and is an RS-485 interface for PXI. It is an asynchronous interface for communicating with instruments via serial ports. This model has plug-and-play compatibility with Microsoft 2000, NT, XP, Me, and 9x. Therefore, it brings the advantage of automatic configuration for worry-free installation. The device can be easily installed from the user’s current application (such as Visual Basic, Excel Visual, C++, etc.) as a standard serial port.
This model is available in 2-port and 4-port configurations. In the 2-port configuration DB-9, the male connector is combined with the standard pin arrangement of the RS232 and RS485 connectors. The 4-port version of the NI PXI-8423 is equipped with a modular 10-bit telephone jack. However, these phone jacks can be converted to DB-25 or DB-9 male connectors using converter cables that can be purchased separately.
The NI PXI-8423 offers advanced features such as universal PCI, flexible baud rates up to 2 Mb/s, and multi-processor and hyper-threading compatibility. Using this model, users will be able to communicate with devices operating at standard baud rates within 0.01%. In addition, it allows communication with devices operating at non-standard baud rates in the range of 57 b/s to 2 Mb/s. To increase efficiency and speed, the PXI-8423’s hyper-threading and multiprocessor compatibility enables users to take advantage of the latest PC technology. This interface device provides enhanced serial drivers for easy configuration, advanced performance and access to all advanced transceiver control modes.