sbRIO serial port voltage level

[mfitzsimons]

What are the RS-232 votage levels on the sbRIO serial ports?  Signal levels could be:  ±3.3 V, ±5 V, ±10 V, ±12 V, and ±15 V?   ±12 V is what i see commonly for direct connection to a PC's serial port.

[tannerite · Accepted solution]

Hi Matthew,

The signal levels for the sbRIO-9605/06/23/26/33/36 are ±5V. I took a quick screen capture of TX W.R.T GND. The voltages in the datasheet spec. ±5.4V (typical) when loaded with 3k and a minum of ±5.0V. The RS-232 standard can accept a pretty large swing however (-3V to -25V) and (+3V to +25V) for the two logic levels. The screen shot I took was with an unloadeed line so the voltage levels appear higher than typical.

The serial transceiver been used is the MAX3243.

[mfitzsimons]

No disputing the data.  Thanks for the official answer.