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[syntax=bash]Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 8F 00 3B 10 01 25 0A 4C CC 28 03 9C 81 71 59 60 B1
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 8F 00 3B 10 01 29 EF 4C CC 28 03 C8 BF 71 59 64 08
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 92 00 3B 10 01 29 EF 4C CC 28 03 D3 44 71 59 67 9E
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 92 00 3B 10 01 14 F1 4C CC 28 04 2E E0 71 59 6C 88
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 91 00 3B 10 01 14 F1 4C CC 28 04 2E E0 71 59 70 8B
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 91 00 3B 10 01 14 F1 4C CC 28 04 6A B1 71 59 74 9C
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 91 00 3B 10 01 3F 5B 4C CC 28 04 51 30 71 59 77 9A
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 90 00 3B 10 01 3F 5B 4C CC 28 04 20 DE 71 59 7B 1A
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 90 00 3B 10 01 3F 5B 4C CC 28 04 20 DE 71 59 80 1F
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 90 00 3B 10 01 10 9C 4C CC 28 03 73 94 71 59 85 3E
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 90 00 3B 10 01 10 9C 4C CC 28 03 95 3C 71 59 88 0B
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 90 00 3B 10 01 31 34 4C CC 28 04 1F 1B 71 59 8C 32
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 91 00 3B 10 01 31 34 4C CC 28 03 B3 11 71 59 90 C0
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 91 00 3B 10 01 31 34 4C CC 55 5A 02 BE 58 00 05 91
Info:EnergyMeter:Skipping packet with bad checksum 43 wanted 91
Info:EnergyMeter:Consumed 16 unwanted non-header byte in CSE7766 buffer
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 8F 00 3B 10 01 3E 4E 4C CC 28 04 07 B3 71 59 98 E4
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 55 5A 02 BE 58 00 05 8F 00 3B 10 01 25 C7 4C CC 28
Info:EnergyMeter:Skipping packet with bad checksum C8 wanted 28
Info:EnergyMeter:Consumed 7 unwanted non-header byte in CSE7766 buffer
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 55 5A 02 BE 58 00 05 90 00 3B 10 01 25 C7 4C CC 28
Info:EnergyMeter:Skipping packet with bad checksum C9 wanted 28
Info:EnergyMeter:Consumed 7 unwanted non-header byte in CSE7766 buffer
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 90 00 3B 10 01 3D 56 4C CC 28 03 5C D6 71 59 A4 6F
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 92 00 3B 10 01 3D 56 4C CC 28 04 51 82 71 59 A8 17
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 92 00 3B 10 01 2C DD 4C CC 28 04 3F 59 71 59 AC 56
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 90 00 3B 10 01 2C DD 4C CC 28 03 FD AD 71 59 AF 68
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 90 00 3B 10 01 55 DF 4C CC 28 04 3E 98 71 59 B3 C4
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 8E 00 3B 10 01 55 DF 4C CC 28 04 93 FD 71 59 B6 7F
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 8E 00 3B 10 01 4A 20 4C CC 28 03 FE 5F 71 59 BA 85
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 90 00 3B 10 01 4A 20 4C CC 28 03 FE 5F 71 59 BD 8A
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 90 00 3B 10 01 4A 20 4C CC 28 04 37 1A 71 59 C1 83
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 90 00 3B 10 01 3A F4 4C CC 28 04 14 47 71 59 C4 54
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 90 00 3B 10 01 3A F4 4C CC 28 04 04 5E 71 59 C8 5F
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 90 00 3B 10 01 27 0F 4C CC 28 04 54 2F 71 59 CC 8C
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 8E 00 3B 10 01 27 0F 4C CC 28 04 40 32 71 59 D0 7D
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 8E 00 3B 10 01 23 41 4C CC 28 04 40 32 71 59 D3 AE
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 8E 00 3B 10 01 23 41 4C CC 28 04 34 E3 71 59 D7 57
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 8E 00 3B 10 00 FF F1 4C CC 28 04 34 E3 71 59 DB E6
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 8D 00 3B 10 00 FF F1 4C CC 28 04 57 7B 71 59 DF A4
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 8D 00 3B 10 01 2E 5D 4C CC 28 04 57 7B 71 59 E3 44
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 8D 00 3B 10 01 2E 5D 4C CC 55 5A 02 BE 58 00 05 8E
Info:EnergyMeter:Skipping packet with bad checksum 65 wanted 8E
Info:EnergyMeter:Consumed 16 unwanted non-header byte in CSE7766 buffer
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 8E 00 3B 10 01 31 6F 4C CC 28 04 0B B0 71 59 EA 4A
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 55 5A 02 BE 58 00 05 8E 00 3B 10 01 31 6F 4C CC 28
Info:EnergyMeter:Skipping packet with bad checksum 7B wanted 28
Info:EnergyMeter:Consumed 7 unwanted non-header byte in CSE7766 buffer
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 55 5A 02 BE 58 00 05 8E 00 3B 10 01 1B FA 4C CC 28
Info:EnergyMeter:Skipping packet with bad checksum F0 wanted 28
Info:EnergyMeter:Consumed 7 unwanted non-header byte in CSE7766 buffer
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 90 00 3B 10 01 1B FA 4C CC 28 03 49 40 71 59 F7 9B
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 90 00 3B 10 01 3A 15 4C CC 28 03 F2 35 71 59 FA 76
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 90 00 3B 10 01 3A 15 4C CC 28 04 4F 4C 71 59 FE EF
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 90 00 3B 10 01 46 A9 4C CC 28 04 93 FB 71 5A 01 86
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 90 00 3B 10 01 46 A9 4C CC 28 04 2C 3B 71 5A 05 63
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 90 00 3B 10 01 46 A9 4C CC 28 04 2C 3B 71 5A 09 67
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 90 00 3B 10 01 46 A9 4C CC 28 03 7E EC 71 5A 0E 6E
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 90 00 3B 10 01 24 59 4C CC 28 03 97 C5 71 5A 12 F2
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 90 00 3B 10 01 24 59 4C CC 28 04 06 DA 71 5A 16 7B
Info:EnergyMeter:CSE7766 received: 55 5A 02 BE 58 00 05 90 00 3B 10 01 24 59 4C CC 28 03 9E A1 71 5A 1A DD
[/syntax]
byte calCkSum(){
byte sum=0;
for(int i=2; i<23; i++)
sum += inData[i];
return sum;
}
#define ULONG (unsigned long)
. . .
ULONG GData(byte h, byte m, byte l){
return ((ULONG)(h) << 16) | ((ULONG)(m) << 8) | l;
}
TL;DR: If your EARU EAWEM-T-CT uses a BK7231N-based CB2S and a CSE7759B, first back up the 2MB flash and isolate the UART path; as one expert put it, "CSE7759B may interfere" with flashing. This FAQ is for OpenBeken users who can flash the WiFi module but still get missing readings, bad packets, or
NaNcurrent values. [#20843806]
Why it matters: This meter can accept OpenBeken, but successful flashing, safe debugging, and usable energy readings depend on the exact UART wiring, startup commands, and CSE7759B protocol behavior.
| Option | What the thread shows | Main advantage | Main limitation |
|---|---|---|---|
| CSE7759B in EARU EAWEM-T-CT | OpenBeken can be flashed; current parsing may fail | Uses the device you already own | Non-isolated design and protocol mismatch issues |
| BL0942-based meter | Reported as suitable for bidirectional power | Can support negative/import-export power | Often still non-isolated and needs firmware work |
| Isolated meter with RS485/CT | Suggested as safer inside metal boxes | Safer debugging and easier external interface | Different hardware path and extra wiring |
Key insight: Flashing the CB2S is only the first milestone. The harder problem is that several EARU units output CSE7759B UART frames the current OpenBeken CSE7766 driver does not parse correctly, including headers seen as
0x55 0x5Binstead of0x55 0x5A. [#21154820]
0x55 0x5A in the working decode example. [#21007540]nan. [#20843887]0x55 0x5B. [#21154820]NaN because the driver is likely decoding the CSE7759B stream incorrectly. A working OpenBeken snapshot showed about 240.59 V and 22.98 W, yet current stayed nan, even after calibration. The thread later identified a likely cause: the existing OpenBeken code targets CSE7766 behavior, while this meter’s CSE7759B may use a different packet format or header. Another contributor also noted that NaN often comes from division by zero during value extraction. [#20852687]startDriver CSE7766 in autoexec.bat, then enable the alternate UART path. The thread also says to set Flag 26, described as using the alternate UART for BL0942, CSE, and similar chips. One user added startDriver NTP and startDriver CSE7766, then enabled Flag 26, but still saw no CSE logs. That means the startup side is necessary, yet not sufficient if the board wiring or packet format differs. The missing piece may be driver compatibility rather than a menu pin assignment. [#21068506]VoltageSet, and later notes that calibration can also be done from the Web App Tools tab. One user tried calibration multiple times with different loads and still got NaN current, which shows calibration only works after valid UART parsing. Start with known mains voltage and a known resistive load, then adjust voltage, current, and power scaling values until the readings match. [#21065924]CSE7766 for both, yet multiple EARU users captured CSE7759B frames that did not match the expected header or decode logic. That mismatch explains why voltage may appear while current fails, checksums break, or no packets parse at all. The practical conclusion was direct: a separate CSE7759B driver may be required instead of reusing drv_cse7766.c unchanged. [#21154826]0x55 0x5B, even though the datasheet excerpt cited in the thread says 0x55 0x5A. One user captured repeated 24-byte frames from both OpenBeken-flashed and original-firmware devices and consistently saw 0x55 0x5B. That strongly suggests either a device-specific variant, a board-level inversion or corruption effect, or a CSE7759B revision that differs from the referenced document. In practice, OpenBeken will miss valid packets until the driver accepts the actual header observed on hardware. [#21154820]GetData(h,m,l) = ((ULONG)h << 16) | ((ULONG)m << 8) | l. It also warns to cast to ULONG before shifting, or the math can collapse to zero and produce NaN. "CSE7759B is a metering IC that streams 24-byte UART frames, each carrying coefficients, cycle counts, and a checksum for voltage, current, and power calculation." [#21007588]Skipping packet with bad checksum messages and reports that unwanted non-header bytes had to be consumed before resynchronizing. A contributor also states that not every CSE reading is good and gives a checksum rule: sum bytes 2 through 22 and compare that result with the last byte. Filter by header, enforce exactly 24 bytes, verify the checksum, and discard frames that fail any one test. [#21007588]drv_cse7766.c, says online builds can compile it without a full toolchain, and later advises creating a new driver file by copying most of the existing CSE code. For this EARU meter, the first change should be packet detection, because users captured 0x55 0x5B headers instead of 0x55 0x5A. After that, recheck 24-byte framing, checksum logic, and field extraction math. [#21177187]