Check slave on Modbus network

Setup, Configuration and Use Beginners
1

Hi.
How can I check if a Modbus slave is online or I have lost the connection with it?
Something like network health but using Modbus
Thanks in advance.

2

If you are using Modbus binding 1.x, and the slave includes any polled (read) Items, and you have postundefinedonreaderror set true in the binding config - you should be able to write a rule triggered on any one Item state changing from a valid value to Undefined to detect a device failure.

If you move to binding 2.x, you should be able to detect a Thing going offline as an event, in theory.

3

Hi
My system is based on OH2.
I’m not using Things. All the configuration is made with Services and Items.
Am I doing it wrong? It is working right now.
Thanks.

modbus.items

Number Temperature "Temperature [%.1f ºC]" <temperature>  {modbus="slave1:0"}
Switch Rele "Estado" <switch> {modbus="slave1:1"}
Number pin3 "pir1 [%.1f]" <shield>  {modbus="slave1:2"}

Modbus.cfg

poll=1000
serial.slave1.connection=/dev/ttyUSB0:115200:8:none:1:rtu:35:1500:none:none
serial.slave1.type=holding
serial.slave1.id=1
serial.slave1.start=0
serial.slave1.length=3
4

I’m searching into documentation but can’t find information about Modbus and Things.

5

I’ve got no idea about how to check if a Modbus slave is online.
Can you help me friends?
Thanks

6

Hi
I’m still looking for a solution for this issue.
Any tip?
Thanks

7

Are you now using Modbus binding 1.x or 2.x?
For this job, it will be worth your while moving to version 2 if you haven’t already. It will mean a bit of work.

8

Hi rossko57.
Thanks for your interest.
I’m using OH2 and config files shown above.
I’m checking witch version of Modbus binding I’m using.

9

From openhab.log…
186:org.openhab.binding.modbus:1.10.0
How can I upgrade to 2.x?

10

How can I move from Modbus binding 1.x to 2.x?
Please, help, I can’t find how to do it
Thanks