The PD865 Snooper Modbus Serial Input Meter can be programmed as a Modbus RTU Master or Slave. As a Master, the Snooper reads a slave device, scales the data from it, displays the result, and operates the internal relays and 4-20 mA output. As a Slave, it is controlled by a master device. The data sent to it by the master is scaled, displayed, and used to operate the relays and 4-20 mA output. The Snooper is housed in a shallow-depth 1/8 DIN panel meter enclosure that features a NEMA 4X front panel. Data is displayed on an adjustable intensity, six-digit, seven-segment LED display. The Snooper can be powered from 85-265 VAC or 12-36 VDC. It comes standard with 2 relays and is available with 2 additional relays and 4-20 mA output as options.