734883234/modbus

An implementation of the Modbus protocol.

Modbus Protocol

Copyright (c) 2016 - 2017 Keith Cullen

Test Applications

To test the PDU library

$ cd test_mb_pdu

$ make

$ ./test_mb_pdu

To test the RTU ADU library

$ cd test_mb_rtu_adu

$ make

$ ./test_mb_rtu_adu

To test the TCP ADU library

$ cd test_mb_tcp_adu

$ make

$ ./test_mb_tcp_adu

To test the IP authentication library

$ cd test_mb_ip_auth

$ make

$ ./test_mb_ip_auth

To test the RTU master/slave

$ socat -d -d pty,raw,echo=0 pty,raw,echo=0

(In a different terminal)

$ cd test_mb_rtu_slave

$ make

$ ./test_mb_rtu_slave /dev/pts/2

(In a different terminal)

$ cd test_mb_rtu_master

$ make

$ ./test_mb_rtu_master /dev/pts/3

To test the TCP client/server

$ cd test_mb_tcp_server

$ make

$ ./test_mb_tcp_server

(In a different terminal)

$ cd test_mb_tcp_client

$ make

$ ./test_mb_tcp_client

Supported Protocol Versions

Protocol Version	Supported
Modbus TCP	yes
Modbus RTU	yes
Modbus ASCII	no

Supported Function Codes

Function Code	Supported
(0x01) Read Coils	yes
(0x02) Read Discrete Inputs	yes
(0x03) Read Holding Registers	yes
(0x04) Read Input Registers	yes
(0x05) Write Single Coil	yes
(0x06) Write Single Register	yes
(0x07) Read Exception Status (Serial Line Only)	yes
(0x08) Diagnostics (Serial Line Only)	yes
(0x0b) Get Comm Event Counter (Serial Line Only)	yes
(0x0c) Get Comm Event Log (Serial Line Only)	yes
(0x0f) Write Multiple Coils	yes
(0x10) Write Multiple Registers	yes
(0x11) Report Server ID (Serial Line Only)	yes
(0x14) Read File Record	yes
(0x15) Write File Record	yes
(0x16) Mask Write Register	yes
(0x17) Read/Write Multiple Registers	yes
(0x18) Read FIFO Queue	yes
(0x2b) Encapsulated Interface Transport	yes

Validation History

v0.1

BeagleBone Black

Debian 9.1

Linux beaglebone 4.4.88-ti-r125 #1 SMP Thu Sep 21 19:23:24 UTC 2017 armv7l GNU/Linux

HP Pavilion

Ubuntu 16.04

Linux HighCreekLinux 4.13.0-38-generic #43~16.04.1-Ubuntu SMP Wed Mar 14 17:48:43 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux