I have an RS232 to 485 converter so I was thinking the 9 pin com port on my computer was the RS232 and the phone jack end was the 485 part. I would like to hook up to a Trane UCP and it had a jack that said RS232 but looked like a phone jack. Is a serial port a RS232? What would I need to hook up to Trane?
What is the difference in RJ11 RJ45 and a regular phone jack?