Appendix A
Specifications
Getting Started with Your PCI/PXI-6810 SDA
A-2
©
National Instruments Corporation
Absolute min input voltage ................ –12 V
RS-232 Interface
Signals supported ............................... Read Data, Transmit Data, CTS,
RTS (optional)
Handshake support ............................. CTS/RTS (optional)
Max baud rate .................................... 120 Kb/s
Output voltage range .......................... –8 V (low)
+8 V (high)
RS-485 Transmitter
Interface signals ................................. One differential pair per channel
Max baud rate .................................... 10 Mb/s
Differential driver high voltage .......... 5 V (no load)
2 V min (100
Ω
load)
1.5 V min (50
Ω
load)
Differential input threshold ............... –0.2 min
0.2 max
Receiver input hysteresis.................... 100 mV
Digital I/O Interface
Number of transceivers ...................... 8
Operating voltage ............................... Switch-selectable between
onboard 5 V and external
power pin
External Power Supply Requirements
Operating voltage ............................... 2.7 to 3.6 V