MODEL: R8-NM1

R8-NM1 SPECIFICATIONS

ES-9722 Rev.5 Page 4/10

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

MODBUS FUNCTION CODES & SUPPORTED CODES

■ Data and Control Functions

CODE

NAME

01

Read Coil Status

X

Digital output from the slave

02

Read Input Status

X

Status of digital inputs to the slave

03

Read Holding Registers

X

General purpose register within the slave

04

Read Input Registers

X

Collected data from the

eld by the slave

05

Force Single Coil

X

Digital output from the slave

06

Preset Single Registers

X

General purpose register within the slave

07

Read Exception Status

08

Diagnostics

X

09

Program 484

10

Poll 484

11

Fetch Comm. Event Counter

Fetch a status word and an event counter

12

Fetch Comm. Event Log

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

16

Preset Multiple Registers

X

General purpose register within the slave

17

Report Slave ID

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 Registers

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

X

Reset the slave and clear all counters

02

Return Diagnostic Register

X

Contents of the diagnostic data (2 bytes)

03

Change ASCII Input Delimiter

X

Delimiter character of ASCII message

04

Force Listen Only Mode

X

Force the slave into Listen Only Mode