Manufacturer: Allen-Bradley / Rockwell AutomationProSoft Technology PLX31-MBTCP-MBS Modbus TCP/IP to Modbus Serial Gateway with One Serial Communication Port and One Ethernet Port for remote configuration and diagnostics, Serial RS-232, 485 and 422, SD Card Slot for storing configuration files (SD Card is not included), DIN-rail mounted, 24V DC Power, allows high-speed bi-directional data transfers between Modbus TCP/IP-enabled PACs and Modbus Serial devices