Hello, I am currently trying to create a module that will connect to my iSaver+ Pool Pump inverter and allow me to read the current state of the pool pump from the unit.
Pool pump regulator manual: [Manual (page 8) ]
I have set up an ESP-32 with a TTL to RS485 converter and have managed to send a custom command and see a response from the unit.
The iSaver+ uses non-standard Modbus protocol commands which are detailed in this document here: RS485 Protocol.
The issue I have is that when receviing the standard response code from the unit ESP Home does not seem to receive the last byte of data which means the CRC check fails and I cannot read the response.
You can see in the logs here that only 8 bytes of data are received whereas the protocal calls for a response of 9 bytes. Here are the expected frames for query and response.
The query is working fine and the unit accepts the 8 byte custom command i can send.
You can see in the logs below that only 8 bytes are received as opposed to the 9 bytes expected in the Request Frame table above. Modbus received Byte 252 (0Xfc) is the first byte of the CRC Vericiation Code and then the last byte of that code is always missing. Hence CRC Checksum fails.
[13:33:33][V][modbus_controller:047]: Sending next modbus command to device 170 register 0x19C6 count 1
[13:33:33][VV][uart.arduino_esp32:180]: Flushing...
[13:33:33][V][modbus:220]: Modbus write raw: AA.C3.07.D1.00.00 (6)
[13:33:33][V][modbus_controller:509]: Command sent 0 0x19C6 1
[13:33:33][W][component:214]: Component modbus_controller took a long time for an operation (0.08 s).
[13:33:33][W][component:215]: Components should block for at most 20-30ms.
[13:33:33][C][ota:096]: Over-The-Air Updates:
[13:33:33][C][ota:097]: Address: swimming-pool-pump-temporary.local:3232
[13:33:33][C][ota:100]: Using Password.
[13:33:33][C][ota:103]: OTA version: 2.
[13:33:33][D][uart_debug:114]: >>> AA:C3:07:D1:00:00:0D:4D
[13:33:33][C][api:139]: API Server:
[13:33:33][C][api:140]: Address: swimming-pool-pump-temporary.local:6053
[13:33:33][C][api:142]: Using noise encryption: YES
[13:33:33][C][wifi_info:009]: WifiInfo IPAddress 'Swimming Pool Pump Temporary IP Address'
[13:33:33][V][wifi_info:009]: Unique ID: 'e465b876e55c-wifiinfo-ip'
[13:33:33][VV][scheduler:226]: Running interval 'update' with interval=1000 last_execution=8054 (now=9069)
[13:33:33][V][modbus:042]: Modbus received Byte 170 (0Xaa)
[13:33:33][V][modbus:042]: Modbus received Byte 195 (0Xc3)
[13:33:33][V][modbus:042]: Modbus received Byte 0 (0X0)
[13:33:33][V][modbus:042]: Modbus received Byte 0 (0X0)
[13:33:33][V][modbus:042]: Modbus received Byte 0 (0X0)
[13:33:33][W][modbus:108]: Modbus CRC Check failed! 1001!=00
[13:33:33][V][modbus:042]: Modbus received Byte 0 (0X0)
[13:33:33][V][modbus:042]: Modbus received Byte 0 (0X0)
[13:33:33][V][modbus:042]: Modbus received Byte 252 (0Xfc)
[13:33:33][C][wifi_info:011]: WifiInfo SSID 'Swimming Pool Pump Temporary WiFi'
[13:33:33][V][wifi_info:011]: Unique ID: 'e465b876e55c-wifiinfo-ssid'
[13:33:33][VV][scheduler:226]: Running interval 'update' with interval=1000 last_execution=8093 (now=9145)
[13:33:33][C][wifi_info:012]: WifiInfo BSSID 'Swimming Pool Pump Temporary MAC'
[13:33:33][V][wifi_info:012]: Unique ID: 'e465b876e55c-wifiinfo-bssid'
[13:33:33][C][wifi_signal.sensor:009]: WiFi Signal 'Swimming Pool Pump Temporary WiFi Signal'
[13:33:33][C][wifi_signal.sensor:009]: Device Class: 'signal_strength'
[13:33:33][C][wifi_signal.sensor:009]: State Class: 'measurement'
[13:33:33][C][wifi_signal.sensor:009]: Unit of Measurement: 'dBm'
[13:33:33][C][wifi_signal.sensor:009]: Accuracy Decimals: 0
[13:33:33][V][wifi_signal.sensor:009]: Unique ID: 'e465b876e55c-wifisignal'
[13:33:33][D][uart_debug:114]: <<< AA:C3:00:00:00:00:00:FC
[13:33:33][C][modbus_controller:298]: ModbusController:
[13:33:33][C][modbus_controller:299]: Address: 0xAA
[13:33:33][C][modbus_controller:301]: sensormap
[13:33:34][C][modbus_controller:305]: Sensor type=0 start=0x19C6 offset=0x0 count=1 size=9
[13:33:34][C][modbus_controller:307]: ranges
[13:33:34][C][modbus_controller:310]: Range type=0 start=0x19C6 count=1 skip_updates=0
[13:33:34][V][modbus_controller:047]: Sending next modbus command to device 170 register 0x19C6 count 1
[13:33:34][VV][uart.arduino_esp32:180]: Flushing...
[13:33:34][V][modbus:220]: Modbus write raw: AA.C3.07.D1.00.00 (6)
[13:33:34][V][modbus_controller:509]: Command sent 0 0x19C6 1
[13:33:34][W][component:214]: Component modbus_controller took a long time for an operation (0.08 s).
[13:33:34][W][component:215]: Components should block for at most 20-30ms.
[13:33:34][D][uart_debug:114]: >>> AA:C3:07:D1:00:00:0D:4D
[13:33:34][V][modbus:042]: Modbus received Byte 170 (0Xaa)
[13:33:34][V][modbus:042]: Modbus received Byte 195 (0Xc3)
[13:33:34][V][modbus:042]: Modbus received Byte 0 (0X0)
[13:33:34][V][modbus:042]: Modbus received Byte 0 (0X0)
[13:33:34][V][modbus:042]: Modbus received Byte 0 (0X0)
[13:33:34][W][modbus:108]: Modbus CRC Check failed! 1001!=00
[13:33:34][V][modbus:042]: Modbus received Byte 0 (0X0)
[13:33:34][V][modbus:042]: Modbus received Byte 0 (0X0)
[13:33:34][V][modbus:042]: Modbus received Byte 254 (0Xfe)
[13:33:34][D][uart_debug:114]: <<< AA:C3:00:00:00:00:00:FE
[13:33:34][VV][scheduler:226]: Running interval 'update' with interval=1000 last_execution=8847 (now=9848)
[13:33:34][V][modbus_controller:047]: Sending next modbus command to device 170 register 0x19C6 count 1
[13:33:34][VV][uart.arduino_esp32:180]: Flushing...
[13:33:34][V][modbus:220]: Modbus write raw: AA.C3.07.D1.00.00 (6)
[13:33:34][V][modbus_controller:509]: Command sent 0 0x19C6 1
[13:33:34][W][component:214]: Component modbus_controller took a long time for an operation (0.08 s).
[13:33:34][W][component:215]: Components should block for at most 20-30ms.
[13:33:34][VV][scheduler:226]: Running interval 'update' with interval=1000 last_execution=9054 (now=10144)
[13:33:34][VV][scheduler:226]: Running interval 'update' with interval=1000 last_execution=9093 (now=10144)
[13:33:34][D][uart_debug:114]: >>> AA:C3:07:D1:00:00:0D:4D
[13:33:34][V][modbus:042]: Modbus received Byte 170 (0Xaa)
[13:33:34][V][modbus:042]: Modbus received Byte 195 (0Xc3)
[13:33:34][V][modbus:042]: Modbus received Byte 0 (0X0)
[13:33:34][V][modbus:042]: Modbus received Byte 0 (0X0)
[13:33:34][V][modbus:042]: Modbus received Byte 0 (0X0)
[13:33:35][W][modbus:108]: Modbus CRC Check failed! 1001!=00
[13:33:35][V][modbus:042]: Modbus received Byte 0 (0X0)
[13:33:35][V][modbus:042]: Modbus received Byte 0 (0X0)
[13:33:35][V][modbus:042]: Modbus received Byte 252 (0Xfc)
[13:33:35][D][uart_debug:114]: <<< AA:C3:00:00:00:00:00:FC
[13:33:35][W][modbus_controller:030]: Modbus device=170 set offline
[13:33:35][D][modbus_controller:043]: Modbus command to device=170 register=0x19C6 countdown=0 no response received - removed from send queue
[13:33:35][VV][scheduler:226]: Running interval 'update' with interval=1000 last_execution=9847 (now=10848)
[13:33:35][VV][scheduler:226]: Running interval 'update' with interval=1000 last_execution=10054 (now=11055)
[13:33:35][VV][scheduler:226]: Running interval 'update' with interval=1000 last_execution=10093 (now=11094)
[13:33:36][VV][scheduler:226]: Running interval 'update' with interval=1000 last_execution=10847 (now=11855)
[13:33:36][VV][scheduler:226]: Running interval 'update' with interval=1000 last_execution=11054 (now=12058)
[13:33:36][VV][scheduler:226]: Running interval 'update' with interval=1000 last_execution=11093 (now=12094)
[13:33:37][VV][scheduler:226]: Running interval 'update' with interval=1000 last_execution=11847 (now=12847)
[13:33:37][VV][scheduler:226]: Running interval 'update' with interval=1000 last_execution=12054 (now=13055)
[13:33:37][VV][scheduler:226]: Running interval 'update' with interval=1000 last_execution=12093 (now=13094)
[13:33:38][VV][scheduler:226]: Running interval 'update' with interval=10000 last_execution=3361 (now=13364)
[13:33:38][V][modbus_controller:181]: Updating modbus component
[13:33:38][VV][modbus_controller:185]: Updating range 0x19C6
[13:33:38][V][modbus_controller:148]: Range : 19C6 Size: 1 (0) skip: 0
[13:33:38][V][modbus_controller:047]: Sending next modbus command to device 170 register 0x19C6 count 1
[13:33:38][VV][uart.arduino_esp32:180]: Flushing...
[13:33:38][V][modbus:220]: Modbus write raw: AA.C3.07.D1.00.00 (6)
[13:33:38][V][modbus_controller:509]: Command sent 0 0x19C6 1
[13:33:38][W][component:214]: Component modbus_controller took a long time for an operation (0.09 s).
[13:33:38][W][component:215]: Components should block for at most 20-30ms.
[13:33:38][D][uart_debug:114]: >>> AA:C3:07:D1:00:00:0D:4D
[13:33:38][V][modbus:042]: Modbus received Byte 170 (0Xaa)
[13:33:38][V][modbus:042]: Modbus received Byte 195 (0Xc3)
[13:33:38][V][modbus:042]: Modbus received Byte 0 (0X0)
[13:33:38][V][modbus:042]: Modbus received Byte 0 (0X0)
[13:33:38][V][modbus:042]: Modbus received Byte 0 (0X0)
[13:33:38][W][modbus:108]: Modbus CRC Check failed! 1001!=00
[13:33:38][V][modbus:042]: Modbus received Byte 0 (0X0)
[13:33:38][V][modbus:042]: Modbus received Byte 0 (0X0)
[13:33:38][V][modbus:042]: Modbus received Byte 252 (0Xfc)
[13:33:38][D][uart_debug:114]: <<< AA:C3:00:00:00:00:00:FC
[13:33:38][VV][scheduler:226]: Running interval 'update' with interval=1000 last_execution=12847 (now=13854)
[13:33:38][V][modbus_controller:047]: Sending next modbus command to device 170 register 0x19C6 count 1
[13:33:38][VV][uart.arduino_esp32:180]: Flushing...
[13:33:38][V][modbus:220]: Modbus write raw: AA.C3.07.D1.00.00 (6)
[13:33:38][V][modbus_controller:509]: Command sent 0 0x19C6 1
[13:33:38][W][component:214]: Component modbus_controller took a long time for an operation (0.08 s).
[13:33:38][W][component:215]: Components should block for at most 20-30ms.
[13:33:38][VV][scheduler:226]: Running interval 'update' with interval=1000 last_execution=13054 (now=14099)
[13:33:38][VV][scheduler:226]: Running interval 'update' with interval=1000 last_execution=13093 (now=14099)
[13:33:38][D][uart_debug:114]: >>> AA:C3:07:D1:00:00:0D:4D
[13:33:38][V][modbus:042]: Modbus received Byte 170 (0Xaa)
[13:33:38][V][modbus:042]: Modbus received Byte 195 (0Xc3)
[13:33:38][V][modbus:042]: Modbus received Byte 0 (0X0)
[13:33:38][V][modbus:042]: Modbus received Byte 0 (0X0)
[13:33:38][V][modbus:042]: Modbus received Byte 0 (0X0)
[13:33:38][W][modbus:108]: Modbus CRC Check failed! 1001!=00
[13:33:38][V][modbus:042]: Modbus received Byte 0 (0X0)
[13:33:38][V][modbus:042]: Modbus received Byte 0 (0X0)
[13:33:38][V][modbus:042]: Modbus received Byte 252 (0Xfc)
[13:33:39][D][uart_debug:114]: <<< AA:C3:00:00:00:00:00:FC
[13:33:39][V][modbus_controller:047]: Sending next modbus command to device 170 register 0x19C6 count 1
[13:33:39][VV][uart.arduino_esp32:180]: Flushing...
Setting “disable_crc: TRUE” is not help here.
Any help on how to help resolve this would be greatly appreciated.
NB also tried the the MAX485 RS485 converter (with an actual flow control pin and this also yields the same behviour exactly.)
Here is my YAML:
esphome:
name: swimming-pool-pump-temporary
substitutions:
hostname: 'Swimming Pool Pump Temporary'
sensor_prefix: "Swimming Pool Pump"
esp32:
board: esp32dev
framework:
type: arduino
wifi:
power_save_mode: none
ssid: !secret WIFI_SID
password: !secret WIFI_PSWD
# Enable fallback hotspot (captive portal) in case wifi connection fails
ap:
ssid: Swimpool Temp Htspt
password: !secret ESPHOME_PSWD
captive_portal:
# Enable logging
logger:
#level: INFO
#level: DEBUG
level: VERY_VERBOSE
hardware_uart: UART0
# Enable Home Assistant API
api:
encryption:
key: !secret ESPHOME_KEY
# password: !secret ESPHOME_PSWD
ota:
password: !secret ESPHOME_PSWD
time:
- platform: homeassistant
id: homeassistant_time
# Set up UART for the TTL485 controller
uart:
tx_pin: GPIO17
rx_pin: GPIO16
baud_rate: 1200
stop_bits: 1
data_bits: 8
parity: NONE
id: modbus_uart
debug:
after:
delimiter: "\n"
modbus:
flow_control_pin: GPIO5
id: modbusMaster
send_wait_time: 500ms
uart_id: modbus_uart
disable_crc: false
modbus_controller:
- id: modbusDevice
address: 0xAA # Modbus slave address (AAH in hexadecimal)
command_throttle: 500ms # Minimum time between requests to the device
setup_priority: -10
update_interval: 10s # Interval for checking sensors (adjust as needed)
modbus_id: modbusMaster
# Text sensors with general information
text_sensor:
- platform: version
name: $hostname ESPHome Version
- platform: wifi_info
ip_address:
name: $hostname IP Address
ssid:
name: $hostname WiFi
bssid:
name: $hostname MAC
sensor:
# Uptime sensor
- platform: uptime
name: $hostname Uptime
update_interval: 600s
# WiFi Signal sensor
- platform: wifi_signal
name: $hostname WiFi Signal
update_interval: 60s
- platform: modbus_controller
modbus_controller_id: modbusDevice
name: "Test Modbus"
id: test_modbus
custom_command: [ 0xAA, 0xC3, 0x07, 0xD1, 0x0, 0x0] #MSB first
value_type: S_WORD
register_count: 1
force_new_range: true
response_size: 9
lambda: |-
ESP_LOGV("Modbus Sensor Lambda","Got new data" );
union {
float float_value;
uint16_t raw;
} raw_to_float;
if (data.size() < 4 ) {
ESP_LOGE("Modbus Sensor Lambda", "invalid data size %d",data.size());
return NAN;
}
raw_to_float.raw = data[6] << 8 | data[7];
ESP_LOGV("Modbus Sensor Lambda", "FP32 = 0x%08X => %f", raw_to_float.raw, raw_to_float.float_value);
return raw_to_float.raw;
binary_sensor:
- platform: status
name: $hostname Status
web_server:
port: 80
