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

VIDPRO  84 28434 Cool? (+6)
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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




Picture of the inside:

]

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.
About Author
VIDPRO wrote 1 posts with rating 6 . Been with us since 2023 year.

Comments

p.kaczmarek2 22 Jul 2023 07:53

Thank you, just for the clarity, I will add here some screenshot from device seller's page: https://obrazki.elektroda.pl/5593422200_1690005185_thumb.jpg Here is template within post: { "vendor":... [Read more]

przemsi_ele 28 Jul 2023 15:57

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,... [Read more]

p.kaczmarek2 28 Jul 2023 16:06

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: // turn off... [Read more]

przemsi_ele 29 Jul 2023 09:30

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... [Read more]

sq3evp 01 Aug 2023 08:26

An interesting module, the price is the same regardless of the current - I wonder if they are identical inside? [Read more]

przemsi_ele 02 Aug 2023 09:30

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 [Read more]

przemsi_ele 20 Aug 2023 15:40

new software Build on Aug 20 2023 06:10:59 version 1.17.223 - the same issue i play with commands: SetStartValue 1 0 setchannel 1 1 Info:GEN:CHANNEL_Set channel 1 has changed to 1 (flags... [Read more]

madmak76 28 Aug 2023 22:24

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... [Read more]

przemsi_ele 30 Aug 2023 08:31

this is not a circuit breaker 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... [Read more]

madmak76 30 Aug 2023 10:22

Setting the limits in A/W in the software works because I just checked it, I have this device. [Read more]

przemsi_ele 30 Aug 2023 14:36

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... [Read more]

madmak76 30 Aug 2023 14:58

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... [Read more]

sotossw 14 Oct 2023 16:20

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. [Read more]

p.kaczmarek2 14 Oct 2023 16:42

Which firmware version is shown by Tuya app? [Read more]

sotossw 15 Oct 2023 13:29

It's 1.0.2 [Read more]

joseandres95 18 Oct 2023 16:25

I had the mettering version and yes, I uploaded the dump and could flash it https://github.com/tuya-cloudcutter/tuya-cloudcutter/issues/505 [Read more]

p.kaczmarek2 18 Oct 2023 19:10

The support for your device has been added to the cloudcutter. Thank your for submitting the flash dump. [Read more]

ruhalajm 09 Nov 2023 18:28

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... [Read more]

p.kaczmarek2 09 Nov 2023 18:50

TX2 is a debug log output, it is not used for flashing. Can you configure device via OBK page? [Read more]

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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