Resolving Sim Card Reader RS-232 Error During TM SIM Registration

I’m encountering an RS-232 error with my Sim Card Reader while attempting TM SIM registration. The issue arises after connecting the reader to my system, and the device fails to recognize the inserted SIM card. I’ve checked the cable connection and drivers, but the error persists. Has anyone faced a similar problem or found a reliable solution for this? Any advice on troubleshooting steps would be greatly appreciated!