MODEL: R3-NM4

R3-NM4 SPECIFICATIONS

ES-8331 Rev.6 Page 4/8

http://www.m-system.co.jp/

MODBUS FUNCTION CODES & SUPPORTED CODES

■ Data & Control Functions

CODE

NAME

01

Read Coil Status

X

Digital output from the slave (read/write)

02

Read Input Status

X

Status of digital inputs to the slave (read only)

03

Read Holding Registers

X

General purpose register within the slave (read/write)

04

Read Input Registers

X

Collected data from the eld by the slave (read only)

05

Force Single Coil

X

Digital output from the slave (read/write)

06

Preset Single Register

X

General purpose register within the slave (read/write)

07

Read Exception Status

08

Diagnostics

X

09

Program 484

10

Poll 484

11

Fetch Comm. Event Counter

X

Fetch a status word and an event counter

12

Fetch Comm. Event Log

X

A status word, an event counter, a message count and a eld of event bytes

13

Program Controller

14

Poll Controller

15

Force Multiple Coils

X

Digital output from the slave (read/write)

16

Preset Multiple Registers

X

General purpose register within the slave (read/write)

17

Report Slave ID

X

Slave type / ‘RUN’ status

18

Program 884/M84

19

Reset Comm. Link

20

Read General Reference

21

Write General Reference

22

Mask Write 4X Register

23

Read/Write 4X Register

24

Read FIFO Queue

■ Exception Codes

CODE

NAME

01

Illegal Function

X

Function code is not allowable for the slave

02

Illegal Data Address

X

Address is not available within the slave

03

Illegal Data Value

X

Data is not valid for the function

04

Slave Device Failure

05

Acknowledge

06

Slave Device Busy

07

Negative Acknowledge

08

Memory Parity Error

■ Diagnostic Subfunctions

CODE

NAME

00

Return Query Data

X

Loop back test

01

Restart Comm. Option

Reset the slave and clear all counters

02

Return Diagnostic Register

Contents of the diagnostic data (2 bytes)

03

Change Input Delimiter Character

Delimiter character of ASCII message

04

Force Slave to Listen Only Mode

Force the slave into Listen Only Mode