Summary of Contents for Calex LCT-485
- Page 1 LCT-485 RS-485 Network Interface for ExTemp Infrared Temperature Sensor Operator’ s Guide...
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Page 2: Model Numbers
Master. IMPORTANT INFORMATION FOR USE: The LCT-485 is not suitable for use in a hazardous area. It MUST ONLY be connected in the safe area, and protected by a suitable Intrinsically Safe isolator or barrier. Do not attempt to repair a faulty unit. Contact the vendor to arrange a return. -
Page 3: Mechanical Installation
MECHANICAL INSTALLATION Mounting The LCT-485 is designed to be attached to a 35 mm DIN rail via the included clip. ELECTRICAL INSTALLATION The LCT-485 is not certified for use in hazardous areas. It must only be connected on the safe side of the Intrinsically Safe isolator or barrier. - Page 4 Intrinsically Safe Isolator or Barrier LCT-485 must not be connected directly to the ExTemp sensor. It must only be used in conjunction with either an Intrinsically Safe isolator or zener barrier. The isolator or barrier must be capable of simultaneously passing an analogue 4-20 mA signal with a superimposed digital signal such as Frequency Shift Keying (FSK).
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Page 5: Operation
Turn on the power supply Turn on the indicator (if fitted) Send a test message to confirm communications with LCT-485 are good (we recommend reading from address 0xD0, Modbus Slave address) Send a test message to confirm communications with ExTemp sensor are good (we... - Page 6 2 stop bits register (W) Reply delay (at ExTemp registers: 1 s max Write multiple 0x10 9600 baud) register (W) LCT-485 registers: 30 ms (single register) 50 ms (whole address space) LIST OF MODBUS REGISTERS (EXTEMP REGISTERS) Address Description Default Min.
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Page 7: Recovery Mode
1 stop bit. After several messages, the LCT-485 will temporarily revert to these settings until the power is cycled. This will allow the original correct settings to be read from the LCT-485. These recovery settings are not stored, and they do not overwrite the existing settings. -
Page 8: Maintenance
IMPORTANT • The LCT-485 is not suitable for use in a hazardous area. It MUST ONLY be connected in the safe area, and protected by a suitable Intrinsically Safe isolator or barrier. • Do not operate this unit near strong electromagnetic fields (e.g. around generators or induction heaters).