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Flashing New Tongou TO-Q-SY1-JWT Device: DIN Rail Switch and Meter, BK7231 template script

VIDPRO 28395 84

TL;DR

  • Tongou TO-Q-SY1-JWT DIN rail switch and meter was flashed with a BK7231 template script.
  • The BK7231N has all pins reachable, so the unit was flashed via serial and a config was attached.
  • All LEDs, the relay, and the meter are fully functional after flashing.
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  • Just flashed a new device:

    vendor: tongou
    model: TO-Q-SY1-JWT

    This is a Switch and Meter for DIN Rail.

    You can buy it on Aliexpress:
    https://de.aliexpress.com/item/1005005441249591.html
    Flashing New Tongou TO-Q-SY1-JWT Device: DIN Rail Switch and Meter, BK7231 template script

    Flashing New Tongou TO-Q-SY1-JWT Device: DIN Rail Switch and Meter, BK7231 template script

    Picture of the inside:

    Flashing New Tongou TO-Q-SY1-JWT Device: DIN Rail Switch and Meter, BK7231 template script Flashing New Tongou TO-Q-SY1-JWT Device: DIN Rail Switch and Meter, BK7231 template script ]

    All Pins of the BK7231N are reachable.
    Just flashed it via serial and made the attached config.

    All LEDs, Relay, and Meter are fully functional. [
    Attachments:
    • config_template.txt (543 Bytes) You must be logged in to download this attachment.

    Cool? Ranking DIY
    About Author
    VIDPRO
    Level 1  
    Offline 
    VIDPRO wrote 1 posts with rating 6. Been with us since 2023 year.
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  • #2 20663290
    p.kaczmarek2
    Moderator Smart Home  
    Posts: 14412
    Help: 650
    Rate: 12357
    Thank you, just for the clarity, I will add here some screenshot from device seller's page:
    Flashing New Tongou TO-Q-SY1-JWT Device: DIN Rail Switch and Meter, BK7231 template script
    Here is template within post:
    Code: JSON
    Log in, to see the code

    And here's device manual:
    TO-Q-SY1-M..ual.pdf (1.55 MB)You must be logged in to download this attachment.
    Helpful post? Buy me a coffee.
  • #3 20671634
    przemsi_ele
    Level 12  
    Posts: 62
    Help: 1
    Rate: 14
    użyłem do tego modelu
    "24": "BridgeFWD;1",
    "26": "BridgeREV;1"

    nie tak jak w powyższym template
    ustawiłem ze po zaniku zasilania przekaźnik ma się wyłączyć SetStartValue 1 0
    przekaźnik włączony, po odłączeniu zasilania i ponownym podłączeniu w interfejsie webowym pokazuje się off , jednak obk nie przerzuca przekaźnika tak aby wyłączyć odbiór ?
    ktoś coś może podpowiedzieć lub sprawdzić u siebie, soft z dzisiaj 1.17.203
  • #4 20671638
    p.kaczmarek2
    Moderator Smart Home  
    Posts: 14412
    Help: 650
    Rate: 12357
    I don't know if the bridge driver author added support for initial state.

    Maybe we can try to make some kind of work around...

    Create autoexec.bat with the following script:
    Code: text Expand Select all Copy to clipboard
    
// turn off power after 4 secs (repeating event with 1 repeat)
addRepeatingEvent 4 1 setChannel 1 0

    I have assumed that bridge relay is configured to be on channel 1.
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  • #5 20672260
    przemsi_ele
    Level 12  
    Posts: 62
    Help: 1
    Rate: 14
    p.kaczmarek2 wrote:
    I don't know if the bridge driver author added support for initial state.

    Maybe we can try to make some kind of work around...

    Create autoexec.bat with the following script:
    Code: text Expand Select all Copy to clipboard
    
// turn off power after 4 secs (repeating event with 1 repeat)
addRepeatingEvent 4 1 setChannel 1 0

    I have assumed that bridge relay is configured to be on channel 1.


    Yes, brigde is setup on channel 1
    manualy "save and run as script" working properly, but after disconnect and connect AC, state of switch and LED is off, but bridge doesn't react, and relay remain closed.

    It's the same situation like "SetStartValue 1 0"

    update:
    hmmm ?
    first i remove autexec.bat then check all combinations:
    H bridge on channel 1
    set SetStartValue 1 0 ; then AC off/on; then Led_n 1 - off , bridge not react - issue ?
    set SetStartValue 1 1 ; then AC off/on; then Led_n 1 - on , bridge set on - ok !
    set SetStartValue 1 -1 ; then AC off/on; then Led_n 1 and brigde work properly ( remeber last state ) - ok !
  • #6 20675853
    sq3evp
    Level 39  
    Posts: 6348
    Help: 211
    Rate: 835
    An interesting module, the price is the same regardless of the current - I wonder if they are identical inside?
  • #7 20677316
    przemsi_ele
    Level 12  
    Posts: 62
    Help: 1
    Rate: 14
    sq3evp wrote:
    An interesting module, the price is the same regardless of the current - I wonder if they are identical inside?

    There is a minimum two hw version, with green paint of solder mask, and the second one with red. I saw pictures with 12V and 5V DC coil
  • #8 20700999
    przemsi_ele
    Level 12  
    Posts: 62
    Help: 1
    Rate: 14
    przemsi_ele wrote:
    p.kaczmarek2 wrote:
    I don't know if the bridge driver author added support for initial state.

    Maybe we can try to make some kind of work around...

    Create autoexec.bat with the following script:
    Code: text Expand Select all Copy to clipboard
    
// turn off power after 4 secs (repeating event with 1 repeat)
addRepeatingEvent 4 1 setChannel 1 0

    I have assumed that bridge relay is configured to be on channel 1.


    Yes, brigde is setup on channel 1
    manualy "save and run as script" working properly, but after disconnect and connect AC, state of switch and LED is off, but bridge doesn't react, and relay remain closed.

    It's the same situation like "SetStartValue 1 0"

    update:
    hmmm ?
    first i remove autexec.bat then check all combinations:
    H bridge on channel 1
    set SetStartValue 1 0 ; then AC off/on; then Led_n 1 - off , bridge not react - issue ?
    set SetStartValue 1 1 ; then AC off/on; then Led_n 1 - on , bridge set on - ok !
    set SetStartValue 1 -1 ; then AC off/on; then Led_n 1 and brigde work properly ( remeber last state ) - ok !


    new software Build on Aug 20 2023 06:10:59 version 1.17.223 - the same issue
    i play with commands:
    Code: text Expand Select all Copy to clipboard
    
SetStartValue 1 0
setchannel 1 1 
Info:GEN:CHANNEL_Set channel 1 has changed to 1 (flags 0) 
Info:DRV:Bridge Driver: 90915 : FORWARD PULSE 

    relay is on
    Code: text Expand Select all Copy to clipboard
    reboot

    relay is on
    Code: text Expand Select all Copy to clipboard
    setchannel 1 0
Info:GEN:No change in channel 1 (still set to 0) - ignoring

    obk "thinks" that channel 1 is set to 0, first command (SetStartValue 1 0) works fine
    after reboot it set flag to 0, but doesn't send msg to bridge

    i modyfied autoexec.bat
    Code: text Expand Select all Copy to clipboard
    
addRepeatingEvent 1 1 setChannel 1 1
addRepeatingEvent 2 1 setChannel 1 0


    works fine for me, but if relay is off before reboot or AC lost, relay will toggle on/off
  • #9 20712391
    madmak76
    Level 11  
    Posts: 15
    >>20663233
    I understand that this device has a relay/contactor inside, a current measurement module and a Bekken circuit in a housing with dimensions that fit the Din rail and looks like an overcurrent switch, but the structure inside has nothing to do with it?

    I would be grateful for a hint because I am looking for someone who has it all together.
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  • #10 20714066
    przemsi_ele
    Level 12  
    Posts: 62
    Help: 1
    Rate: 14
    this is not a circuit breaker

    Quote:
    I understand that this device has a relay/contactor inside, a current measurement module and a Bekken circuit in a housing with dimensions that fit the Din rail and looks like an overcurrent switch, but the structure inside has nothing to do with it?


    that's right, the only thing that can be done is to set an alarm for exceeding the current threshold in Tuya with a resolution of 1A, but I have not checked whether it disconnects the relay after exceeding the defined threshold.
  • #11 20714219
    madmak76
    Level 11  
    Posts: 15
    Setting the limits in A/W in the software works because I just checked it, I have this device.
  • #12 20714628
    przemsi_ele
    Level 12  
    Posts: 62
    Help: 1
    Rate: 14
    I have erau and tongou models , in one the green plate and in the other the red plate.
    I import them from Tuya to HA but it does not show me in HA the measurement entity, only the switch, the sockets of Tuya have measurement entities, how is it with you ? Maybe you also have them paired with HA ?
  • #13 20714654
    madmak76
    Level 11  
    Posts: 15
    I launched this device only to check its correct operation after receiving the shipment from the Chinese. I checked how it worked through the tuya app. I guess it was automatically detected in ha through tuya local or local tuya because I have both add-ons installed.
    I'll check when I'm home if I didn't remove it from HA.

    I'm going to sell it because then I found with the same functionality devices with ewelink software and such I already have a dozen at my place and they automatically add themselves correctly to ha with full functionality and not like those with tuya.
  • #14 20770269
    sotossw
    Level 2  
    Posts: 2
    Just wondering have anyone successfully flashed it through tuya-cloudcutter OTA? I tried mine (I have the non-metering version btw) but I get an exploit not successful message.
  • #15 20770288
    p.kaczmarek2
    Moderator Smart Home  
    Posts: 14412
    Help: 650
    Rate: 12357
    Which firmware version is shown by Tuya app?
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  • #18 20775534
    p.kaczmarek2
    Moderator Smart Home  
    Posts: 14412
    Help: 650
    Rate: 12357
    The support for your device has been added to the cloudcutter. Thank your for submitting the flash dump.
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  • #19 20807093
    ruhalajm
    Level 3  
    Posts: 5
    Hi i tryed to flash the openbeken it worked fine, but now i cant write the configuration on it throws an error.
    and same thing if i try to read it gives an error.
    what difference is the rx1 tx1 and rx2 tx2 pins i used the rx1 and tx1 for the flashing.
  • #20 20807122
    p.kaczmarek2
    Moderator Smart Home  
    Posts: 14412
    Help: 650
    Rate: 12357
    TX2 is a debug log output, it is not used for flashing.

    Can you configure device via OBK page?
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  • #21 20807199
    ruhalajm
    Level 3  
    Posts: 5
    Kind of stupid question how do i get to web page because i havent got any information on the device yet, so no wifi connection.
    or does it connect trough serial somehow?
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  • #22 20807258
    p.kaczmarek2
    Moderator Smart Home  
    Posts: 14412
    Help: 650
    Rate: 12357
    after repowering it should create an open access point, just like Tasmota does
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  • #23 20813578
    holydiver1983
    Level 1  
    Posts: 1
    Hi, I have 3 of these devices,
    1 metering with firmware 1.0.18
    and 2 non-metering with firmware 1.0.2
    I was able to successfully flash the 2 non metering ones with tuya-cloudcutter
    but with the metering one it wasn't successful, the one device profile with 1.0.18 doesn't work.
    Do you guys have any suggestions?
  • #24 20813646
    ruhalajm
    Level 3  
    Posts: 5
    I'm also interested to know is there anyway to restore the original firmware, i wasn't able to flash working firmware, even tough the flasher reported that is was succesfull doing so and now it doesn't find the din rail switch at all.
  • #25 20813668
    p.kaczmarek2
    Moderator Smart Home  
    Posts: 14412
    Help: 650
    Rate: 12357
    So it's not creating AP? What does the debug log output on TX2 pin says?
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  • #26 20813696
    ruhalajm
    Level 3  
    Posts: 5
    haven't tested the tx2 yet, i'll try that but for now it doesn't regognize the board, and it makes no difference if i power the device off.
    at first try i did managed to read the original firmware, the flasher software finds the configuration on that read, so it worked one time atleast.

    Serial port open!
    Getting bus... (now, please do reboot by CEN or by power off/on)
    Getting bus failed, will try again - 0/100!

    Added after 4 [minutes]:

    and it's not creating the AP and only way i got it flashing was use the 1500000 baud rate on com port other speeds did throw an error.
  • #27 20813717
    p.kaczmarek2
    Moderator Smart Home  
    Posts: 14412
    Help: 650
    Rate: 12357
    What is your flashing circuit?

    I have flashed more than hundred BK7231 devices (also for users) and it all worked reliably, so there must be some configuration issue on your side.

    Please provide more information and I will try my best to help you resolve the problem.
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  • #28 20813742
    ruhalajm
    Level 3  
    Posts: 5
    I have an generic chinese clone siliconlabs CP210x usb uart bridge and this has worked until now i have flashed succesfully 11pcs
    BK7231 devices with it, does it make any difference what firmware was on the device before trying to flash openbk on it?
    Well if it doesnt work i'll use tuya intergration with HASS for time being, but i would be nice to get working that wrong fashed one .
  • #29 20973495
    yorainoy
    Level 1  
    Posts: 1
    Does anyone have the technical data of the product, it need to write the frequency inside
  • #30 20974133
    Spag
    Level 3  
    Posts: 3
    Rate: 2
    >>20813578

    Same here, not able to flash the version with power metering V1.0.18 (via CloudCutter).

    Any idea?
    Thanks!

    Added after 2 [hours] 41 [minutes]:

    OK so I destroyed the rivets, took my solder iron and after a very dirty job, I was able to flash it using BK7231 GUI Flash Tool. Yay!
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Topic summary

✨ The Tongou TO-Q-SY1-JWT is a DIN rail mount smart switch and energy meter based on the BK7231N chip and BL0942 power metering IC. Users successfully flashed the device with OpenBeken firmware via UART after opening the case by drilling rivets, as OTA flashing via Tuya CloudCutter is unreliable or unsupported for some firmware versions (notably metering firmware v1.0.18). The device supports relay control, LEDs, button input, and power metering, with GPIO pins mapped for these functions (e.g., pins 9 and 15 for LEDs, 17 for button, 24 and 26 for relay control). Relay behavior on power loss can be configured using SetStartValue commands or autoexec.bat scripts to restore or force relay state after reboot. Calibration of the BL0942 meter is essential for accurate power measurement, including voltage, current, and power factor; calibration can be done using resistive loads like incandescent bulbs or by extracting original calibration data from Tuya firmware. The device is not a circuit breaker and should not be used as a safety disconnect. Some hardware versions differ in PCB color and coil voltage (5V or 12V). The newer SY2 model uses a shunt resistor instead of a coil and adds overcurrent and overvoltage protection features, which may be software-configurable via BL0942 registers but lack dedicated hardware signaling. ESPHome support is emerging with device pages and calibration improvements. Users report issues such as relay coil heating when driven by pulse commands instead of continuous signals, and occasional unexplained relay power-offs requiring log retention for diagnostics. Flashing challenges include ensuring proper UART connections, stable 3.3V power supply, and correct baud rates (e.g., 921600 or 1500000). Debug logs can be captured via the TX2 pin. Sealing the device after opening can be done using M2.5x10 screws or insulated ferrules. Overall, the community provides detailed pin mappings, flashing instructions, calibration tips, and firmware configuration examples to enable reliable operation and integration with Home Assistant and ESPHome.
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FAQ

TL;DR: “99 % of BK7231N DIN-rail switches flash in <3 min over UART” [Elektroda, silvestro_gatto, post #21173683] “Flashing was quite straightforward” [Elektroda, silvestro_gatto, post #21173683] Use 3.3 V, short CEN to GND, 921 600 baud. Why it matters: fast local firmware = full Home-Assistant control and no Tuya cloud.

Quick Facts

• Chipset: BK7231N Wi-Fi MCU + BL0942 power-meter IC [Elektroda, p.kaczmarek2, post #20663290] • Recommended UART flashing speed: 921 600 baud [Elektroda, silvestro_gatto, post #21173683] • Supply for flashing: stable 3.3 V / ≥300 mA (USB-UART alone may reset) [Elektroda, p.kaczmarek2, post #21402384] • Typical retail cost: US $16-20 on AliExpress [AliExpress listing] • Relay type: bi-stable 1-pole, driven by pins P24 (FWD) & P26 (REV) [Elektroda, Thread Template, post #20663290]

Which pins do I connect to flash the Tongou TO-Q-SY1/2-JWT?

Connect 3.3 V and GND to the CBU module; RX1→USB-TX, TX1→USB-RX, and momentarily short CEN to GND to enter boot. Optional: monitor logs on TX2 [Elektroda, silvestro_gatto, post #21173683]

The flasher keeps showing “Getting bus failed”—what causes this?

Most failures come from weak power or long jumper wires. Use an external 3.3 V supply ≥300 mA, keep leads <10 cm, match baud (921 600 or 1 500 000), and reset with CEN-to-GND pulse [Elektroda, p.kaczmarek2, post #21402384]

Why does my coil heat to 55 °C after flashing?

Continuous HIGH on BridgeFWD/REV holds current. Use BridgeFWD/BridgeREV pins (pulsed) instead of Rel; set pulse width 100 ms to avoid overheating [Elektroda, dwmw2, post #21265055]

Can I dump original Tuya calibration values?

Yes. Read flash, locate vref/iref/pref/eref words and import them; ESPHome PR #7421 and OBK PowerSet/VoltageSet commands accept these numbers [Elektroda, dwmw2, post #21190960]

Power readings are 5× too high in standby—how to fix?

Enable Flag 25 (allow negative power) and perform a two-point calibration with a known resistive load and real-world inductive load; error falls below 2 % after calibration [Elektroda, casiopeia80, post #21556434]

Does SY2 add hardware over-current/voltage protection?

No discrete link from BL0942 CF1 to driver exists; protection is handled in Tuya software. In OpenBeken you can mimic it with addChangeHandler Voltage > 250 POWER OFF etc. [Elektroda, leśny_ziutek, post #21487925]

Is OTA flashing with Tuya-cloudcutter supported?

Only firmware ≤1.0.2 (non-metering) and 1.0.18 (metering) are currently exploitable; newer 1.0.20 requires UART [Elektroda, p.kaczmarek2, post #20974510]

Edge case: relay clicks but no continuity after reverse wiring—what happened?

Back-feeding line/load can weld or misalign the bi-stable contacts; replacement of the relay is required [Elektroda, dwmw2, post #21197592]

3-Step How-To: flash via UART quickly

  1. Solder or clip to 3.3 V, GND, RX1, TX1, CEN. 2. In BK7231Flasher select BK7231N, 921 600 baud, click “Read+Flash”. 3. Pulse CEN to GND; wait ≤180 s for “Success”. [Elektroda, silvestro_gatto, post #21173683]

Can I log events before random shutdowns?

Create autoexec.bat: startDriver Syslog 192.168.x.x 514 and addChangeHandler Relay 0 addLog; the device then streams last-hours logs to a syslog server [Elektroda, firsoff091, post #21110271]

Where can I buy replacement sealing ferrules?

Uninsulated 1.5 mm² ferrules, 18 mm length, Ø2 mm slide straight into the holes; pack of 200 on Amazon item B08QS2KR49 [Elektroda, onkel11, post #21080758]
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