heeeyyy mine is working now, with the SDM72 
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you need to change custom command to
custom_command: [ 0x2, 0x4, 0x00, 0x48,0x00, 0x02]
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I see you have 0x02 as the first command, is your SDM set at address 2?
Hi guys, I have a 630 and 72 I can’t get them to work… Can you please share your configurations and what you adjusted manually?
I have this converter. Which converters are you using? I connected the RX from the ESP to TX of the converter. B- to B- of the meter.
Nothing shows up on the UART.
Down below is my minimal example. I set the stop bits to 2 manually in the meter. Messed around with different values, nothing seems to work.
Converter RX LED is blinking every 3 seconds so signal is coming through. Does the converter need the same Ground as the ESP? The ESP is connected independently via a USB power brick and a microUSB cable.
logger:
# level: DEBUG
baud_rate: 0
web_server:
port: 80
uart:
tx_pin: GPIO1
rx_pin: GPIO3
baud_rate: 9600
stop_bits: 2
debug:
sensor:
- platform: sdm_meter
frequency:
name: "Sdm630 Frequency"
update_interval: 3s
I got the SDM630 working with the same converter board as in your picture.
Powered it with 5Vdc.
Txd and Rxd to GPIO 1 and GPIO3 of the D1 mini. (hardware uart)
A of the converter to A of the SDM.
B of the converter to B of the SDM.
I used a 120Ohm resistor between A and B on the SDM side, not sure if this is needed.
I didn’t connect the ground on the converter or SDM.
I use the default settings of the sdm630(address = 1, parity = none, baudrate = 9600, stopbits = 1)
Below is SDM part of my code:
esphome:
name: "warmtepomp-sdm"
esp8266:
board: d1_mini
# Enable logging
logger:
level: verbose
baud_rate: 0 # <--- must be disabled because gpio1/3 are used for modbus
#serial port
uart:
id: mod_uart
tx_pin: GPIO1
rx_pin: GPIO3
baud_rate: 9600
stop_bits: 1
modbus:
send_wait_time: 500ms
uart_id: mod_uart
id: mod_bus
#modbuscontroller to read SDM630
modbus_controller:
- id: sdm
address: 0x0001
modbus_id: mod_bus
update_interval: 15s
sensor:
- platform: modbus_controller
modbus_controller_id: sdm
name: "Warmtepomp Total active energy"
id: total_energy
# address: 0x156 --> zie sdm630 manual
# register_type: "read"
## reimplement using custom_command
# 0x1 : modbus device address
# 0x4 : modbus function code
# 0x1 : high byte of modbus register address
# 0x56: low byte of modbus register address
# 0x00: high byte of total number of registers requested
# 0x02: low byte of total number of registers requested
custom_command: [ 0x1, 0x4, 0x1, 0x56,0x00, 0x02]
value_type: FP32
unit_of_measurement: kWh
accuracy_decimals: 1
- platform: modbus_controller
modbus_controller_id: sdm
name: "Warmtepomp Total system power demand"
id: total_system_power
# address: 0x034 zie SDM630 manual
# register_type: "read"
## reimplement using custom_command
# 0x1 : modbus device address
# 0x4 : modbus function code
# 0x1 : high byte of modbus register address
# 0x54: low byte of modbus register address
# 0x00: high byte of total number of registers requested
# 0x02: low byte of total number of registers requested
custom_command: [ 0x1, 0x4, 0x0, 0x34,0x00, 0x02]
value_type: FP32
unit_of_measurement: W
accuracy_decimals: 1
Both leds of the converter board should be blinking when communication is running.
Hope this helps.
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Thank you @drled!
I will try your setup and report back.
I thought Eastron SDM meters are officially supported: Eastron SDM Energy Monitor — ESPHome
It’s really wierd because these meters are insanely popular.
UPDATE: I replicated exactly your setup, doesn’t work for me, the SDM is not answering.
What does the logger outputs? If the SDM is not responding, you should atleast see the modbus command in the logger output.
Also the tx led on your rs485 converter should blink if the command is sent…
Also check this, i reverted my esphome to version 11.5:
yes the first command is address on the sdm
@dried: how did you revert to ESPHome 11.5 ? Been having CRC errors as well on Modbus since the last update (in my case reading my Growat inverter locally via RS485, kind of the same setup you are running)
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I went to the “backups” section in home assistant, there i found backups that were taken right before the upgrade of esphome. If you click on one of those it should be possible to restore one of the older versions.
@dried: I remembered I programmed/updated my ESP32’s for the first time from the CLI of my Macbook. So, I checked the version, it was 11.2 (so older than 12.0), reprogrammed/flashed my ESP32 from the CLI and now … everything works again !
So, something in ESPHome 12.0 is messing up the way the GPIO pins read/write the data.
I’m leaving my ESP32 alone for now, it works with 11.2
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So I have this minimal config:
logger:
level: verbose
uart:
tx_pin: GPIO1
rx_pin: GPIO3
baud_rate: 9600
sensor:
- platform: sdm_meter
frequency:
name: "Sdm630 Frequency"
total_power:
name: "SDM630M Total Power"
update_interval: 5s
And here is the log.
Everything is cabled up correctly, nothing is happening except the RX LED of the modbus-rs232 converter is blinking.
I would appreciate every bit of help.
I have managed to get the SDM72D-M Energy Meter working with esphome.
I have pasted my code as a snippet here: Gitlab Snippet
Here the short version as an example:
uart:
id: mod_uart
tx_pin: D2
rx_pin: D1
baud_rate: 9600
stop_bits: 1
modbus:
send_wait_time: 500ms
uart_id: mod_uart
id: mod_bus
modbus_controller:
- id: SDM72DM
modbus_id: mod_bus
address: 1
setup_priority: -10
sensor:
# General
- platform: modbus_controller
modbus_controller_id: SDM72DM
name: ${friendly_name} AvgFreq
register_type: read
address: 0x0046
value_type: FP32
unit_of_measurement: Hz
state_class: "measurement"
accuracy_decimals: 3
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Thank you for posting your snippet. I’m going to try it out. Would you mind attaching an image of exactly how you wired everything up?
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Try TX to TX and RX to RX on the ESP/RS485-module connection
And TRY USING SOFTWARE UART! As JFK344 did, that finally fixed it for me:
uart:
id: mod_uart
tx_pin: D2 #this line
rx_pin: D1 #and this one, use these pins (others could work, but these are fine)
baud_rate: 9600
stop_bits: 1
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How often is ESPhome actually sending the Modbus energy values over the API or MQTT to HA? Can this be configured?
I am having 4 of these SDM 72 D-M with modbus and can connect those in a series cause they are in the distribution panel, but the inverter is roughly 40 cable meters away on the other side of the house.
I would like to know if such esphome is capable to deal with all 4 energymeter at once. and deliver the sensors via LAN to the pi with Home Assistant
If you pick a capable ESP device it should work yes 
esphome itself is as capable as your computer so that is not the bottleneck
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Where should I start to read in such case of multiple devices or sdm 72 dm ?
Thanks
This person seems to be in the same predicament:
Just google the type of KwH meter and I am sure youll find plenty of examples
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