28 User GuideConnecting the instrumentWARNINGAll connections must be established in a de-energized state. Before working on the circuit,secure the breaker to prevent any accidental power-up.In an explosion proof/flameproof installation, do not remove the covers while theinstrument is energized.ELECTROSTATIC DISCHARGESElectronic components are sensitive to electrostatic discharges.Before performing any connection, operators shall make sure that they have discharged allstatic electricity from their body before touching electronic components.NOTICEEnsure that a drip loop 1 (water trap) is used when installing the connecting cables forthe sensor. If necessary, rotate the transmitter housing as necessary.—Figure 19 Typical LWT Modbus connectionModbus®MasterDevicePower supply10.5 to 28.5 V DCLWT Modbus®InstrumentA (+)B (–)PWR+–A (+)B (–)+–GNDRS-485CommunicationLink
