Overview
The REL22503 lists protocol order as Modbus RTU IEC 60870-5-103 DNP3, while the P225------2---- lists Modbus RTU DNP3 IEC 60870-5-103. The difference is the protocol priority in the firmware; both support the same three protocols, so they are functionally interchangeable for Modbus RTU and DNP3 networks.
The REL22503 is discontinued. Sourcing is via surplus and broker channels; an RFQ confirms available quantity and lead time.
