Multitek MultiLed M812-LD Series Operating Manual page 54

Function 4 (04 hex) - read input registers. (3X)
These registers contain the measured and calculated values of the
instrument. Register addresses in the instrument start at 0 but in
keeping with Modicon Modbus codes, are
designated addresses starting at 30001.
Packet from master format :
[Node Addr][04][reg start addr(2 bytes)][No. of reg (2 bytes)]
[CRC(2 bytes)]
Response from slave format:
[Node Addr][04](Byte count][Data (byte count bytes)][CRC(2 bytes)]
The table below lists the parameter with the Modbus
equivalent address and its address within the
MultiLed. Any data requested that isn't applicable to the Type &
System column, will return the value -ve infinity (FFFFFFFFh)
3X REGS
Registers
name
Volts L2-L1
Volts L3-L2
Volts L1-L3
System Volts L1* 30007
System Volts L2* 30009
System Volts L3* 30011
System Amps L1 30013
System Amps L2 30015
System Amps L3 30017
Modbus Reg, Start
Addr, (dec) Addr. (hex)
30001 0000
30003 0002
30005 0004
0006
0008
000A
000C
000E
0010
53
MultiLed Type &
System Type
M812-LD9 & LD4
M812-LD9 & LD4
M812-LD9 & LD4
All types
M812-LD9 & LD4
M812-LD9 & LD4
All types
M812-LD9 & LD4
M812-LD9 & LD4