RLE LD2100 V.2.6 - Manual (Page 70)

70 LD2100 User Guide 800.518.1519
5 Modbus Communication
5.2.2 Function 04: Read Input Registers
To read the LD2100 input values, the master must send a Read Input Registers request packet.
The Read Input Registers request packet specifies a start register and the number of registers
to read. The start register is numbered from zero (30001 = zero, 30002 = one, etc).
40011 Spare 0-65535
40012 Spare 0-65535
40013 Spare 0-65535
40014 Spare 0-65535
40015 Spare 0-65535
40016 Leak Alarm Delay Leak Alarm Delay 5-995 seconds 0-65535
40017 Contamination Alarm
Delay
Contamination Alarm
Delay
5-995 seconds 0-65535
Table 5.3 Output Registers
Register Name Description Units Range
Table 5.4 Read Input Registers Packet Structure
Read Registers Request Packet Read Registers Response Packet
Slave Address (1 byte) Slave Address (1 byte)
04 (Function code) (1 byte) 04 (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)
…
Cry Checksum (2 bytes)
Table 5.5 Input Registers
Register Name Description Units Range
30001 Status Bit level status None 0-65535
30002 Leak Distance Location of leak Ft/Meters 0-65535
30003 Units Unit of measure 1=Ft 0=Meters 0-65535
30004 Leak Current Leakage current on
cable
uAmps 0-65535
30005 Cable Length Installed cable length Ft/Meters 0-65535
30006 Loop1 Res Resistance of cable Ohms 0-65535
30007 Loop2 Res Resistance of cable Ohms 0-65535
30008 Res/Ft Resistance of cable Ohms x1000 0-65535