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Wiring diagrams for hart devices and the field communicator application the trex unit can communicate with a device from the control room on the bench or any wiring termination point in the loop connect the lead set to the trex unit and to the communication terminals on the device or across the resistor below each diagram a table lists . Familiarize themselves with installation and wiring instructions in addition to requirements of all applicable codes laws hart module scanning diagram with pass through messages 189 highway addressable remote transducer analog i o. Reference manual 00809 0100 4444 rev ag october 2018 rosemounttm 8732em transmitter with hart protocol reference manual. 4 20 ma transmitter wiring several transmitter wiring options exist the design of the associated control panel dictates which option should be used these wiring options include current source transmitter non isolated 3 wire current sink transmitter non isolated 3 wire fully isolated 4 wire two wire loop powered transmitters