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Function 04: read input registers, Table 5.4, Read input registers packet structure – RLE LD2100 V.2.6 User Manual

Page 70: Table 5.5, Input registers, 2 function 04: read input registers

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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