Baud Rates
The maximum baud rates supported are listed in the table below.
| Hardware Platform | Maximum Baud Rate | |
|---|---|---|
| RS-232 | RS-485 | |
| PCI-843x | 1000 kbit/s | 3000 kbit/s1 |
| PCI-232/485 | 115.2 kbit/s | 460.8 kbit/s |
| PXI-843x | 1000 kbit/s | 3000 kbit/s1 |
| PXI-842x | 115.2 kbit/s | 460.8 kbit/s |
| USB | 230.4 kbit/s | 460.8 kbit/s |
| ENET | 230.4 kbit/s | 460.8 kbit/s |
| ExpressCard | 230.4 kbit/s | 460.8 kbit/s |
| PCMCIA | 921.6 kbit/s2 | 921.6 kbit/s |
All NI serial hardware supports standard baud rates. In addition, the PCI/PXI-843x family of hardware supports any baud rate between 2 bit/s and the maximum supported baud rate for that interface.
National Instruments considers the following baud rates to be standard. NI serial hardware supports these rates up to the maximum rate specified. Your device may also support additional baud rates not listed below:
| 110 | 14400 |
| 300 | 19200 |
| 600 | 38400 |
| 1200 | 57600 |
| 2400 | 115200 |
| 4800 | 230400 |
| 9600 | 460800 |
To set the baud rate, set the VISA Baud attribute or use the Windows SetCommState function and pass the actual value of the baud rate in the BaudRate field of the DCB structure.
1The two-wire auto control mode for the RS-485 transceiver has a maximum baud rate of 2000 kbit/s.
2The PCMCIA-232/4 has a maximum baud rate of 115.2 kbit/s.