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+--- Thread: Connecting Multiple Modbus Sensors to A16 (ESPHome) (/showthread.php?tid=7082)
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Connecting Multiple Modbus Sensors to A16 (ESPHome) - Gleb - 11-18-2024
I'd like to greet all the forum members. I’m reaching out to ask for your help with an issue I’m experiencing.
I connected 7 sensors to an RS485 Modbus bus, but only 4 of them work simultaneously. When I connect each sensor individually, they all respond correctly. However, when I try to initialize more than 4 sensors in the YAML configuration (e.g., 1-2-3-4), they are displayed and work fine. But as soon as I add more sensors (e.g., 5-6-7), some of them stop responding or are not displayed at all.
I am using an A16 with ESPHome integrated into Home Assistant.
...
uart:
- id: uart_modbus
tx_pin: GPIO13
rx_pin: GPIO16
baud_rate: 4800
modbus:
- uart_id: uart_modbus
setup_priority: -10
send_wait_time: 500 ms
id: modbus1
modbus_controller:
- id: modbus_sensor_2
address: 0x02
modbus_id: modbus1
update_interval: 5s
offline_skip_updates: 2
max_cmd_retries: 4
- id: modbus_sensor_4
address: 0x04
modbus_id: modbus1
update_interval: 5s
offline_skip_updates: 2
max_cmd_retries: 4
- id: modbus_sensor_7
address: 0x07
modbus_id: modbus1
update_interval: 5s
offline_skip_updates: 2
max_cmd_retries: 4
- id: modbus_sensor_8
address: 0x08
modbus_id: modbus1
update_interval: 5s
offline_skip_updates: 2
max_cmd_retries: 4
...
...
sensor:
- platform: modbus_controller
modbus_controller_id: modbus_sensor_2
name: "t_2"
id: temperature_sensor_2
address: 0x0001
register_type: holding
value_type: U_WORD
force_new_range: true
unit_of_measurement: "°C"
accuracy_decimals: 2
filters:
- multiply: 0.1
- platform: modbus_controller
modbus_controller_id: modbus_sensor_2
name: "h_2"
id: humidity_sensor_2
address: 0x0000
register_type: holding
value_type: U_WORD
unit_of_measurement: "%"
accuracy_decimals: 2
filters:
- multiply: 0.1
- platform: modbus_controller
modbus_controller_id: modbus_sensor_4
name: "t_4"
id: temperature_sensor_4
address: 0x0001
register_type: holding
value_type: U_WORD
force_new_range: true
unit_of_measurement: "°C"
accuracy_decimals: 2
filters:
- multiply: 0.1
- platform: modbus_controller
modbus_controller_id: modbus_sensor_4
name: "h_4"
id: humidity_sensor_4
address: 0x0000
register_type: holding
value_type: U_WORD
unit_of_measurement: "%"
accuracy_decimals: 2
filters:
- multiply: 0.1
- platform: modbus_controller
modbus_controller_id: modbus_sensor_7
name: "t_i"
id: temperature_sensor_7
address: 0x0001
register_type: holding
value_type: U_WORD
force_new_range: true
unit_of_measurement: "°C"
accuracy_decimals: 2
filters:
- lambda: |-
if (x > 32767) {
return (x - 65536) / 10.0;
} else {
return x / 10.0;
}
- platform: modbus_controller
modbus_controller_id: modbus_sensor_8
name: "t_k"
id: temperature_sensor_8
address: 0x0001
register_type: holding
value_type: U_WORD
force_new_range: true
unit_of_measurement: "°C"
accuracy_decimals: 2
filters:
- multiply: 0.1
...
RE: Connecting Multiple Modbus Sensors to A16 (ESPHome) - admin - 11-18-2024
which sensor you are using? Can you take a photo.
RE: Connecting Multiple Modbus Sensors to A16 (ESPHome) - Gleb - 11-19-2024
(11-18-2024, 12:13 PM)админ Wrote: Какой датчик вы используете? Можно сделать фото.
RE: Connecting Multiple Modbus Sensors to A16 (ESPHome) - admin - 11-19-2024
i suggest you use a USB-RS485 adapter to test your sensor directly first step. if the sensor work well , then add to KC868-A16 board.
RE: Connecting Multiple Modbus Sensors to A16 (ESPHome) - Gleb - 11-19-2024
Maybe you misunderstood me.
I've already changed the addresses on all the sensors. All the addresses are different. The sensors are connected individually or in groups of less than 5 without problems. But when I initialize MORE than 5 sensors in YAML, the panel also shows 5 sensors (and the added sensors are not polled, I don't see them in the logs). And any 5 sensors are displayed, in any combinations.
My system needs a minimum of 6 sensors to work.
In general, I can connect an additional RSMAX module for one more sensor, but it is strange, because the bus is designed for a huge number of devices.
RE: Connecting Multiple Modbus Sensors to A16 (ESPHome) - Gleb - 11-19-2024
I apologize for the misinformation.
- It turns out that all sensors are displayed in the logs, but home assistant does not display them correctly. No more than 5 sensors.
RE: Connecting Multiple Modbus Sensors to A16 (ESPHome) - admin - 11-19-2024
next month when have free time, i will test 6pcs of RS485 temperature sensors with one bus in home assistant, then feedback to you.
RE: Connecting Multiple Modbus Sensors to A16 (ESPHome) - Gleb - 11-20-2024
(11-19-2024, 10:51 PM)admin Wrote: next month when have free time, i will test 6pcs of RS485 temperature sensors with one bus in home assistant, then feedback to you.
Thank you!
RE: Connecting Multiple Modbus Sensors to A16 (ESPHome) - Gleb - 11-20-2024
Moreover, I noticed that in the hass panel, while connecting more than 4 sensors, some sensors display their correct value or the one that was lost.
RE: Connecting Multiple Modbus Sensors to A16 (ESPHome) - admin - 11-20-2024
can you reduce the baud rate of sensor?