This project forked from andresarmento/modbus-arduino
A library that allows your Arduino to communicate via Modbus protocol, acting as a slave. Application layer library (OSI 7), used by all implementations over serial line and TCP/IP.
Home Page: https://epsilonrt.github.io/modbus-arduino/
License: BSD 3-Clause "New" or "Revised" License
When we write 2 registers it works:
~$ mbpoll -a10 -b38400 -P none -t4 -r25 com4 2 1
mbpoll 1.5 - FieldTalk(tm) Modbus(R) Master Simulator
Copyright (c) 2015-2023 Pascal JEAN, https://github.com/epsilonrt/mbpoll
This program comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to redistribute it
under certain conditions; type 'mbpoll -w' for details.
Protocol configuration: Modbus RTU
Slave configuration...: address = [10]
start reference = 25, count = 2
Communication.........: com4, 38400-8N1
t/o 1.00 s, poll rate 1000 ms
Data type.............: 16-bit register, output (holding) register table
Written 2 references.
But 3 it doesn't work!
~$ mbpoll -a10 -b38400 -P none -t4 -r27 com4 2 0 0 -v
debug enabled
Set mode to RTU for serial port
Set device=com4
3 write data have been found
Set data=2
Word[0]=0x2
Set data=0
Word[1]=0x0
Set data=0
Word[2]=0x0
mbpoll 1.5 - FieldTalk(tm) Modbus(R) Master Simulator
Copyright (c) 2015-2023 Pascal JEAN, https://github.com/epsilonrt/mbpoll
This program comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to redistribute it
under certain conditions; type 'mbpoll -w' for details.
Opening com4 at 38400 bauds (N, 8, 1)
Set response timeout to 1 sec, 0 us
Protocol configuration: Modbus RTU
Slave configuration...: address = [10]
start reference = 27, count = 3
Communication.........: com4, 38400-8N1
t/o 1.00 s, poll rate 1000 ms
Data type.............: 16-bit register, output (holding) register table
[0A][10][00][1A][00][03][06][00][02][00][00][00][00][A4][7E]
Waiting for a confirmation...
<0A><86><03><73><A3>
ERROR Invalid exception code
Write output (holding) register failed: Invalid exception code
Hi @epsilonrt ,
I appreciate your work with the modbus-arduino library. Your additions will definitely be a great contribution to the community.
In addition to that, I would like to ask you to provide some examples using functions 1 3, 6, and 10. For starters, that will be a good starting point.
Whole Modbus program hang when read 8 or 16 or 8*n coils using Read Coil Status (FC=01).
However it is normal when read 1-7 ,9-15 , 17-23 , etc.
The loop is still running. Seem something overflow in the program.
2023/04/08 23:17:24 >>> 0E 01 00 00 00 08 3D 33
2023/04/08 23:17:24 < 0E 01 01 2A D3 43 43 4F 52 52 55 50 54 20 48 45 41 50 3A 20 42 61 64 20 74 61 69 6C 20 61 74 20 30 78 33 66 63 39 31 37 34 37 2E 20 45 78 70 65 63 74 65 64 20 30 78 62 61 61 64 35 36 37 38 20 67 6F 74 20 30 78 62 61 61 64 35 36 66 38 0D 0A
It should return 0D 02 02 FF FF but coil 8 looks wrong?
PACKAGES:
.pio\libdeps\teensy41\Modbus-Arduino\src\Modbus.cpp: In member function 'void Modbus::reportServerId()':
.pio\libdeps\teensy41\Modbus-Arduino\src\Modbus.cpp:697:13: warning: 'char* strncpy(char*, const char*, size_t)' specified bound depends on the length of the source argument [-Wstringop-truncation]
697 | strncpy ( (char *) &_frame[4], _additional_data, strlen (_additional_data));
Whole Modbus program hang when read 8 or 16 or 8*n coils using Read Coil Status (FC=01).
However it is normal when read 1-7 ,9-15 , 17-23 , etc.
The loop is still running. Seem something overflow in the program.
2023/04/08 23:17:24 >>> 0E 01 00 00 00 08 3D 33
2023/04/08 23:17:24 < 0E 01 01 2A D3 43 43 4F 52 52 55 50 54 20 48 45 41 50 3A 20 42 61 64 20 74 61 69 6C 20 61 74 20 30 78 33 66 63 39 31 37 34 37 2E 20 45 78 70 65 63 74 65 64 20 30 78 62 61 61 64 35 36 37 38 20 67 6F 74 20 30 78 62 61 61 64 35 36 66 38 0D 0A
Howdy epsilonrt,
please find attached a patch for a hash based approach in order to map Modbus addresses to a TRegister
struct. In my specific case with 96 holding regs, 96 input regs, 96 coils, 96 discrete inputs I observed a
speedup of factor 5 in my main loop. I believe this is worth the expense of 28 extra RAM bytes in a
Modbus object.
BR,
Christian
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