I had 2 failed old Elkron motion alarm sensors (4 core) wired in series as in pictures. They are in adjacent rooms connected through a wall with short cable. They worked well and did the job. I have 2 Texecom Capture P15s to replace. The control panel is Scantronic 9448+. There are no added resistors. Can I just wire these in the same way? Do I need to change the resistor setting inside one or both sensors if in series? Many thanks for any advice.