Appologies if I am misusing/abusing specifications.

Question: Is it possible to send serial signals via the PC's COM port? Is it further possible to split this port somehow and send signals to two different devices?

Motivation: My end game is to accomplish the following

  1. Generate serial signals such as "0101U" (see here, last page)
  2. Send these signals from a linux computer through an RS232 cable
  3. Send those signals from the RS232 cable to a CAT5 ethernet cable
  4. Send those signals from the Cat5 ethernet cable to a Somfy URTSII interface device
  5. Get Somfy URTSII interface device to control roller blinds.
  6. Accomplish this for 2 Somfy URTSII devices

My initial thoughts were to control the Somfy URTSII device with a single Raspberry Pi, by purchasing an RS232 cable with a built in level converter, and then a DB9 to RJ45 connector, and building two of these, one for each Somfy URTSII device. However, if I can control the devices (either one or both) from the PC's COM port, I will save about $35-$70.


PC serial COM ports are RS232 ports. I once once used a RS232 null modem between two of them to send files between two computers.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.