[RC232] I would like to know how to use the pins N°27 and 28 on the RC2500HP Pin 27 and 28 must be left open. Last Update: August 8, 2017 December 20, 2016 1384 RC232 Q&A Related Knowledge Base Posts -[RC232] Can you please suggest us how to read the set value of PWM?[RC232] “I have a question for the RC2500HP-RC232, which seems not to be listed in the datasheet. We have the RC2500HP-RC232 connected to a supply voltage of 3.3v. Which voltage will the uart tx output from the RC2500HP-RC232 be? We found a other note on your site, that suggested that it would only have 2.7v on the uart tx pin, even though the module was supplied with 3.3v. “[RC232] I want to know if you information about the transmission distance regarding the power RF level ?