Designed by Trust Automation, the TA821 Copper Reduction modules convert electrical encoder, hall sensor and limit signals to an optical signal and then back into electrical signals. They are designed for robotics, medical applications, linear slides, machining centers, and applications in high electrical noise areas or applications that require high flexibility harnesses. The company says that because of their compact size (3.50 x 3.03 x 0.75 inches), the lightweight TA821 transmit and receive modules can be mounted with the motor and on a linear stage. Available in 1-, 2-, and 4-axis modules, they are designed to accept standard signals. Signal inputs include: 5VDC Differential Encoder (A, B, Index), 5VDC Differential Hall Sensors, and 5-24VDC Home and limit sensors. The power requirement for each module is 5VDC and each unit features a Power-On Status LED.