RLE LD2000 - Manual (Page 53)

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5 Modbus Communication
5.2. Packet Communications for the LD2000
This section covers the registers with the name and a brief description of each.
5.2.1 Function 03: Read Output Registers
To read the LD2000 parameter values, the master must send a Read Output Registers request
packet.
The Read Output Registers request packet specifies a start register and the number of registers
to read. The start register is numbered from zero (40001 = zero, 40002 = one, etc).
Table 5.2 Read Output Register Packet Structure
Read Registers Request Packet Read Registers Response Packet
Slave Address (1 byte) Slave Address (1 byte)
03 (Function code) (1 byte) 03 (Function code) (1 byte)
Start Register (2 bytes) Byte count (1 byte)
# of registers to read (2 bytes) First register (2 bytes)
Crc Checksum (2 bytes) Second register (2 bytes)
…
Crc Checksum (2 bytes)
Table 5.3 Output Registers
Register Name Description Units Range
40001 Leak Threshold Trip current for leak alarm 25-295 uAmps 0-65535
40002 Contamination
Threshold
Trip current for
contamination alarm
20-295 uAmps 0-65535
40003 Spare 0-65535
40004 Spare 0-65535
40005 Spare 0-65535
40006 Spare 0-65535
40007 Spare 0-65535
40008 Spare 0-65535
40009 Spare 0-65535
40010 Spare 0-65535
40011 Spare 0-65535
40012 Spare 0-65535
40013 Spare 0-65535
40014 Spare 0-65535