RS485 interface type data module type B, as retrofit kit for:, STP 5000TL-20, STP 6000TL-20, STP 7000TL-20, STP 8000TL-20, STP 9000TL-20, STP 10000TL-20, STP 12000TL-20, WTP 5000TL-20, WTP 6000TL-20, WTP 7000TL-20, WTP 8000TL-20, WTP 9000TL-20
