Schneider Electric TM3BCSL bus coupler module, Modicon TM3, distributed IO, optimized, Serial Line interface, IP20. This product is part of Modicon TM3, a range of expansion I/O modules for Modicon plcs. This is a bus coupler for the Modbus serial link. Official Schneider characteristics include Range of product: Modicon TM3; Product or component type: I/O distributed module; Product compatibility: Logic controller Motion controller; Communication port protocol: Modbus serial; Communication network type: Modbus; Web services: Web server, USB; Current consumption: 0.8 A at 24 V DC internal supply maximum 7 expansion modules; Exchange mode: Half duplex.