TCP Modbus

[leondias]

Hello,

I'm trying to make a connection with Modbus TCP slave device.

I tried to do so with scripts (you can see it below) and visual mapper.
In visual mapper I tried many different combinations in device profile, but couldn't get right value:

Code:

{ "name": "Input 1", "bus_datatype": "float16", "type": "register", "address": 128, "datatype": "float16", "value_multiplier": 1, "units": " C" },
{ "name": "Input 1", "bus_datatype": "uint16", "type": "register", "address": 128, "datatype": "float16", "value_multiplier": 1, "units": " C" },
{ "name": "Input 1", "bus_datatype": "int16", "type": "register", "address": 128, "datatype": "int16", "value_multiplier": 1, "units": " C" }
and etc..

Full script (IP address of device is corrent - 192.168.1.210, port - 502, slave ID - 20):

Code:

require('luamodbus')

if not mb then
    mb = luamodbus.tcp()
    mb:open('192.168.1.210')
    mb:connect()
end

-- verbose output and select slave number 10
mb:setdebug(true)
mb:setslave(20)

-- read input from reg 1 to 5, get slave-specific data
local result = mb:readregistervalue(128, dt.float16)
grp.write('14/1/0', result, dt.float16)


local value = mb:reportslaveid()
alert(value)

-- close serial connection
mb:close()

[admin]

Are you sure it's float16 on ModBus side? float16 is KNX-specific datatype and I've only seen one ModBus AC unit which has it as register value. Also, second mb:readregistervalue() parameter must be a string, not a dt.something. Do you have documentation for your ModBus device?

[leondias]

Are you sure it's float16 on ModBus side? float16 is KNX-specific datatype and I've only seen one ModBus AC unit which has it as register value. Also, second mb:readregistervalue() parameter must be a string, not a dt.something. Do you have documentation for your ModBus device?

Yes, here it is

Now I try to read jus a outdoor temp. to get started. In the documentation its 129 address, but I'm trying with all 128, 129 and 130 to be sure

[admin]

Datatype should be "float32", you also might have to set "read_swap" property as stated here: http://openrb.com/docs/modbus.htm

[leondias]

Datatype should be "float32", you also might have to set "read_swap" property as stated here: http://openrb.com/docs/modbus.htm

Can I use this property in script or only in visual mapper?
If yes, how?

[admin]

You can use in both, but first you need to figure out correct byte/word order by using this in your script:

Code:

v1 = mb:readregistervalue(128, 'float32', 'n')
v2 = mb:readregistervalue(128, 'float32', 'b')
v3 = mb:readregistervalue(128, 'float32', 'w')
v4 = mb:readregistervalue(128, 'float32', 'bw')
log(v1, v2, v3, v4)

One of the values in logs should be correct.

[leondias]

Thanks a lot! It works!

[unaxboy]

Thanks a lot! It works!

Hi leondias, I also trying to config Ping2. Can you share json with me?)

[unaxboy]

Are you sure it's float16 on ModBus side? float16 is KNX-specific datatype and I've only seen one ModBus AC unit which has it as register value. Also, second mb:readregistervalue() parameter must be a string, not a dt.something. Do you have documentation for your ModBus device?

Yes, here it is

Now I try to read jus a outdoor temp. to get started. In the documentation its 129 address, but I'm trying with all 128, 129 and 130 to be sure

I try do the same, but with writable addresses (315, 513, 533, 771, 1050).

Please, can someone help?

[admin]

Are you trying to make a profile or use scripts? In any case you need to subtract 1 from documented address, so 315 becomes 314 and so on.

[unaxboy]

Are you trying to make a profile or use scripts? In any case you need to subtract 1 from documented address, so 315 becomes 314 and so on.

I trying with profile. With read only addresses it works without subtract.

[admin]

For writable addresses you have to add "writable": true

[unaxboy]

For writable addresses you have to add "writable": true

My code:

Code:

   {
     "name": "Start/Stop",
     "bus_datatype": "bool",
     "datatype": "float32",
     "type": "register",
     "address": 315,
     "writable": 1,
     "value_custom": {
       "0": "Stop",
       "1": "Start",
     "read_swap": "n"
     }
   },

[admin]

datatype must be int16 or uint16, also try address 314

[unaxboy]

datatype must be int16 or uint16, also try address 314

Thanks! It's working. Trying the same for 771 (770). No luck(

[admin]

What value are you getting? Try setting read_swap to b, datatype should be set to uint16, bus_datatype can be float16 and set value_multiplier to 0.01

[unaxboy]

What value are you getting? Try setting read_swap to b, datatype should be set to uint16, bus_datatype can be float16 and set value_multiplier to 0.01

Thank you! Setting value_multiplier to 0.01 helped.

For everyone who use Komfovent Ping2 (modbus gateway for Komfovent ventilation AHU) my profile in attachment.

[Igor68]

Hi, help, please solve the problem. It is necessary to send a command to the infrared module using the Modbus TCP/IP protocol.
Team 01 02 00 00 00 0B 01 10 04 4F 00 02 04 00 03
Where 01 02 00 00 00 0B - MBAP header
01-number of the device in the network ID
10-function command FC
04 4F -address
mb: writeregisters (1103,0, 3) does not work.
With the help of programm Modbus Pool, commands are sent and executed)

[admin]

Try adding mb:setslave(1) before writeregisters

[SportMaster10]

Hi!

A Komfovent DOMEKT REGO-400PE-AC-C4 recuperator with C4-plus automation is installed in my house.
According to the documentation (https://www.vortvent.nl/wp-content/uploa...N-2016.pdf) port settings 19200-8E1, slave_id = 20 , registrs 1000-1362.
Experimentally discovered that in fact the registers start at 10000.
Maybe someone has a complete list of registers and their purpose for C4-plus?

Thanks.