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EMS-LTE User Manual
Read and Write Holding Coil (Function Code 1, Function Code 5, Function Code 15.)
Register Address
(Decimal)
Definition Description
0 RTU DO0
DO0 Value, Read/Write, 1=Close, 0=Open
1 RTU DO1
DO1 Value, Read/Write, 1=Close, 0=Open
2 RTU DO2
DO2 Value, Read/Write, 1=Close, 0=Open
3 RTU DO3 DO3 Value, Read/Write, 1=Close, 0=Open
4--63 (Reserved, not work)
Modbus RTU Master Function
When RS485 as Modbus RTU Master with mapping registers, support max 16 slaves for connecting PLC,
Remote I/O data acquisition module, Smart meter, Power monitoring module, Smart transducer, Diesel
generator, UPS, Accumulator battery monitoring system, etc. Can mapping register value from Slave to
Master, these registers’ can be setup high or low threshold value, and NC/NO type, moreover, can enable
to send SMS to users once alarm occurrence by the registers if required.
Adding Slave
(Extend I/O tags or Modbus RTU converter to SMS alarm gate way)
When RS485 as Modbus RTU Master, can extend I/O tags, support max 16 slaves for
connecting PLC, Remote I/O data acquisition module, Smart meter, UPS, Power
monitoring., etc.
When RS485 as Modbus RTU Master, the device will be polling the
slaves, read the salve register value to device mapping address and stock them as
below. The yellow part is mapping register area.