MTL1142 Transmitter Power Supply. MTL1142 is a 1 channel analogue input isolator with current source or current sink output. It provides HART communication for Smart two wire transmitters. The signal conditioner is DIN Rail mountable. Features and Benefits. 1 Channel, smart for 2/4 wire transmitters Transmitters can be interrogated either from the operator station or by a hand held communicator (HHC) Power supplied via the power bus embedded in the DIN Rail 4 to 20 mA output current source or sink, switch selectable DIN Rail mounting