Modbus comunication failure with some devices
Hello,
I have a trouble reading modbus values from a solar plant inverter.
I configured the zabbix agent, but when I try to read the values I receive the timeout error.
I have other devices configured and working on same agent. Agent is running on Ubuntu 24.04.
zabbix_agent2.conf
Plugins.Modbus.Sessions.MB1.Endpoint=tcp://10.1.66.35:502
Plugins.Modbus.Sessions.MB1.SlaveID=1
Plugins.Modbus.Sessions.MB1.Timeout=5
Plugins.Modbus.Sessions.MB2.Endpoint=rtu://ttyr00:19200:8e1
Plugins.Modbus.Sessions.MB2.SlaveID=1
Plugins.Modbus.Sessions.MB2.Timeout=10
Plugins.Modbus.Sessions.MB13.Endpoint=tcp://10.1.66.10:502
Plugins.Modbus.Sessions.MB13.SlaveID=16
Plugins.Modbus.Sessions.MB13.Timeout=10
This is the error received from Zabbix Agent
zabbix_agent2 -t modbus.get[MB13,,3,32089,1,uint16]
modbus.get[MB13,,3,32089,1,uint16] [m|ZBX_NOTSUPPORTED] [Unable to read: read tcp 10.1.66.5:41936->10.1.66.10:502: i/o timeout]
zabbix_agent2 -t modbus.get[MB13,,3,32090,1,uint16]
modbus.get[MB13,,3,32090,1,uint16] [m|ZBX_NOTSUPPORTED] [Unable to read: read tcp 10.1.66.5:53044->10.1.66.10:502: i/o timeout]
zabbix_agent2 -t modbus.get[MB13,,4,32089,1,uint16]
modbus.get[MB13,,4,32089,1,uint16] [m|ZBX_NOTSUPPORTED] [Unable to read: read tcp 10.1.66.5:49132->10.1.66.10:502: i/o timeout]
With mbpoll the comunication works
mbpoll -a 16 -t 4 -r 32089 -o 2 10.1.66.10
mbpoll 1.0-0 - FieldTalk(tm) Modbus(R) Master Simulator
Copyright © 2015-2019 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 TCP
Slave configuration...: address = [16]
start reference = 32089, count = 1
Communication.........: 10.1.66.10, port 502, t/o 2.00 s, poll rate 1000 ms
Data type.............: 16-bit register, output (holding) register table
-- Polling slave 16... Ctrl-C to stop)
Read output (holding) register failed: Connection timed out
-- Polling slave 16... Ctrl-C to stop)
[32089]: 1510
Thank you
Regards
I have a trouble reading modbus values from a solar plant inverter.
I configured the zabbix agent, but when I try to read the values I receive the timeout error.
I have other devices configured and working on same agent. Agent is running on Ubuntu 24.04.
zabbix_agent2.conf
Plugins.Modbus.Sessions.MB1.Endpoint=tcp://10.1.66.35:502
Plugins.Modbus.Sessions.MB1.SlaveID=1
Plugins.Modbus.Sessions.MB1.Timeout=5
Plugins.Modbus.Sessions.MB2.Endpoint=rtu://ttyr00:19200:8e1
Plugins.Modbus.Sessions.MB2.SlaveID=1
Plugins.Modbus.Sessions.MB2.Timeout=10
Plugins.Modbus.Sessions.MB13.Endpoint=tcp://10.1.66.10:502
Plugins.Modbus.Sessions.MB13.SlaveID=16
Plugins.Modbus.Sessions.MB13.Timeout=10
This is the error received from Zabbix Agent
zabbix_agent2 -t modbus.get[MB13,,3,32089,1,uint16]
modbus.get[MB13,,3,32089,1,uint16] [m|ZBX_NOTSUPPORTED] [Unable to read: read tcp 10.1.66.5:41936->10.1.66.10:502: i/o timeout]
zabbix_agent2 -t modbus.get[MB13,,3,32090,1,uint16]
modbus.get[MB13,,3,32090,1,uint16] [m|ZBX_NOTSUPPORTED] [Unable to read: read tcp 10.1.66.5:53044->10.1.66.10:502: i/o timeout]
zabbix_agent2 -t modbus.get[MB13,,4,32089,1,uint16]
modbus.get[MB13,,4,32089,1,uint16] [m|ZBX_NOTSUPPORTED] [Unable to read: read tcp 10.1.66.5:49132->10.1.66.10:502: i/o timeout]
With mbpoll the comunication works
mbpoll -a 16 -t 4 -r 32089 -o 2 10.1.66.10
mbpoll 1.0-0 - FieldTalk(tm) Modbus(R) Master Simulator
Copyright © 2015-2019 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 TCP
Slave configuration...: address = [16]
start reference = 32089, count = 1
Communication.........: 10.1.66.10, port 502, t/o 2.00 s, poll rate 1000 ms
Data type.............: 16-bit register, output (holding) register table
-- Polling slave 16... Ctrl-C to stop)
Read output (holding) register failed: Connection timed out
-- Polling slave 16... Ctrl-C to stop)
[32089]: 1510
Thank you
Regards