AMI Option; 3rd signal output 3rd signal output interface for AMI transmitter 0/4 – 20 mA signal output for AMI transmitter parallel use with AMI USB Option Specifications AMI Option; 3rd signal output. Contact us to place an order. Related Products AMI Option; USB Interface AMI Option; Profibus- / Modbus Interface AMI Option; Hyperterminal Interface AMI Option; HART Interface