try to receive some information from Daikin EKHHE
to receive some data, i use an Waveshare RS232/485 ETH Converter. I connect the converter to the CN23 in parallel of the Displaypanel from the Device
i openend the website of the RS485 Converter and use these setting to establish a conncetion
the important part is to use 9600 baud, as TCP Server i use my home automation system named symcon.
This unit sents data with Modbus Ascii, this have fixed length/values. This is good for us. But before...
*** DISCLAIMER *** Warning, this information has been compiled by reverse engineering. I assume no liability for damages, errors or other problems. If you are not sure, don't do it!
some examples:
This string contains some values, we start counting our array by zero
DD 01 00 00 00 00 37 37 06 00 0F 05 0A 4E 00 00 00 01 1E 00 00 07 00 00 00 7F 05 CD 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 0E 62
| Name | Parametertype (manual) | description |
|---|---|---|
| Array no: 0 | start always with Hex DD | is our starting block to get temperature information |
| Array no: 6 | B | value in HEX, a value of 37 means 55 degress |
| Array no: 7 | A | same as above |
| Array no: 8 | C | same as above |
| Array no: 10 | D | same as above |
| Array no: 11 | E | same as above |
| Array no: 12 | F | same as above |
| Array no: 13 | G | same as above |
| Array no: 14 | H | same as above |
| Array no: 18 | I | lowercase i |
| Array no: 21 | Digital In 1-3 | this contains the stati in reversed bit order*1 |
*1 off means, that the Digital Input is openend anf on means, its closed.
| Digital Input 3 | Digital Input 2 | Digital Input 1 | Array 21 result |
|---|---|---|---|
| 1 (off) | 1 (off) | 1 (off) | 7 |
| 1 (off) | 1 (off) | 0 (on) | 6 |
| 1 (off) | 0 (on) | 1 (off) | 5 |
| 1 (off) | 0 (on) | 0 (on) | 4 |
| 0 (on) | 1 (off) | 1 (off) | 3 |
| 0 (on) | 1 (off) | 0 (on) | 2 |
| 0 (on) | 0 (on) | 1 (off) | 1 |
| 0 (on) | 0 (on) | 0 (on) | 0 |
The information for the target temperature can be found in this HEX Value started with CC
'CC 01 15 00 1E 3C 0A 00 07 11 1E FB 03 33 32 37 37 32 3E 3E 07 04 41 07 02 02 00 00 00 03 00 01 01 0A 28 0A 8C 3E 4B 1E 0F 09 19 58 04 FF 00 00 02 02 01 00 00 00 00 00 00 15 08 20 2B F9 19 0C 5A 32 14 00 01 7F A7`
| Name | Parametertype (manual) | description |
|---|---|---|
| Arrayno: 0 | start always with Hex CC | is our starting block to get more information |
| Arrayno: 1 | Multiparameter | 0 = standby, 1 = on and more Parameter *2 |
| Arrayno: 2 | Multiparameter | *3 |
| Arrayno: 3 | mode | *4 0 = auto, 1 = eco, 2 = boost, 3 = electric, 4 = fan, 5 = holiday |
| Arrayno: 4 | (P4) | Antilegionella duration |
| Arrayno: 5 | (P7) | Delay between two consecutive defrosting cylce |
| Arrayno: 6 | (P10) | Maximum defrosting duration |
| Arrayno: 7 | (P2) | Electrical heater switching-on delay" |
| Arrayno: 8 | (P8) | Temperature threshold for defrosting start |
| Arrayno: 9 | (P29) | Antilegionella starting hour |
| Arrayno: 10 | ||
| Arrayno: 11 | (P8) | Temperature threshold for defrosting start |
| Arrayno: 12 | (P9) | Temperature threshold for defrosting stop |
| Arrayno: 13 | target temperature | value in HEX, a value of 37 means 55 degress |
| Arrayno: 14 | ||
| Arrayno: 15 | ||
| Arrayno: 16 | ||
| Arrayno: 17 | ||
| Arrayno: 18 | ||
| Arrayno: 19 | ||
| Arrayno: 20 | (P1) | Hysteresis on lower water probe for heat-pump working |
| Arrayno: 21 | (P32) | Temperature threshold for electrical heater usage in AUTO mode |
| Arrayno: 22 | (P3) | Antilegionella setpoint temperature |
| Arrayno: 23 | (P30) | Hysteresis on upper water probe for electrical heater working |
| Arrayno: 24 | (P25) | Offset value on upper water temp probe |
| Arrayno: 25 | (P26) | Offset value on lower water temp probe |
| Arrayno: 26 | (P27) | Offset value on air-inlet temp probe |
| Arrayno: 27 | (P28) | Offset value on defrosting temp probe |
| Arrayno: 28 | (P12) | External pump usage mode |
| Arrayno: 29 | (P14) | Type of evaporator fan |
| Arrayno: 30 | (P24) | Off-peak working mode |
| Arrayno: 31 | (P16) | Solar mode integration |
| Arrayno: 32 | (P23) | Photovoltaic mode integration |
| Arrayno: 33 | (P17) | Heat-pump starting delay after DIG1 opening |
| Arrayno: 34 | (P18) | Lower water probe temperature value to stop the heat-pump in solar mode integration |
| Arrayno: 35 | (P19) | Hysteresis on lower water probe to start the pump in solar mode integration |
| Arrayno: 36 | (P20) | Temperature threshold for solar drain valve / solar collector roll-up shutter action in solar mode integration |
| Arrayno: 37 | (P21) | Lower water probe temperature value to stop the heat-pump in photovoltaic mode integration |
| Arrayno: 38 | (P22) | Upper water probe temperature value to stop the electrical heater in photovoltaic mode integration |
| Arrayno: 39 | (P34) | Superheating calculation period for EEV automatic control mode |
| Arrayno: 40 | (P37) | EEV step opening during defrosting mode (x10) |
| Arrayno: 41 | (P38) | Minimum EEV step opening with automatic control mode (x10) |
| Arrayno: 42 | (P40) | Initial EEV step opening with automatic control mode / EEV step opening with manual control mode (x10) |
| Arrayno: 43 | (P36) | Desuperheating setpoint for EEV automatic control mode |
| Arrayno: 44 | (P35) | Superheating setpoint for EEV automatic control mode |
| Arrayno: 45 | (P41) | AKP1 temperature threshold for EEV KP1 gain |
| Arrayno: 46 | (P42) | AKP2 temperature threshold for EEV KP2 gain |
| Arrayno: 47 | (P43) | AKP3 temperature threshold for EEV KP3 gain |
| Arrayno: 48 | (P44) | EEV KP1 gain |
| Arrayno: 49 | (P45) | EEV KP2 gain |
| Arrayno: 50 | (P46) | EEV KP3 gain |
| Arrayno: 51 | ||
| Arrayno: 52 | if schedule set value is 03 otherwise 00 | |
| Arrayno: 53 | HOUR | start scheduler |
| Arrayno: 54 | MINUTE | start scheduler |
| Arrayno: 55 | HOUR | stop scheduler |
| Arrayno: 56 | MINUTE | stop scheduler |
| Arrayno: 57 | MINUTE | Systemtime min |
| Arrayno: 58 | HOUR | Systemtime hour |
| Arrayno: 59 | ||
| Arrayno: 60 | (P47) | Maximum allowed inlet temperature for heat-pump working |
| Arrayno: 61 | (P48) | Minimum allowed inlet temperature for heat-pump working |
| Arrayno: 62 | (P49) | Threshold on inlet temperature for evaporator EC or AC with double speed blower speed setting |
| Arrayno: 63 | (P50) | Antifreeze lower water temperature setpoint |
| Arrayno: 64 | (P51) | Evaporator EC blower higher speed setpoint |
| Arrayno: 65 | (P52) | Evaporator EC blower lower speed setpoint |
| Arrayno: 66 | ||
| Arrayno: 67 | ||
| Arrayno: 68 | ||
| Arrayno: 69 | (P54) | Low pressure switch bypass time |
| Arrayno: 70 | Checksum | *5 |
*2 Array 1 is an multidimension parameter, there are more combinations.... but its the beginning 0 = aus, 1 = an, 4 = EEV-Steuerungsmodus manuell 10 = Warmwasser-Umwälzpumpe immer an,
| Hex | Binary | Parameter | Value |
|---|---|---|---|
| 0 | 0b00000 | off | 0 |
| 1 | 0b00001 | on | 1 |
| 4 | 0b00100 | P39 | 1 |
| 10 | 0b10000 | P13 | 1 |
*3 Array 2 is a multidimension parameter, there are more combinations.... but its the beginning
| Hex | Binary | Parameter | Value |
|---|---|---|---|
| 11 | 0b10001 | P5 | 0 |
| 1D | 0b11101 | P6 | 1 |
| 14 | 0b10100 | P11 | 0 |
| 15 | 0b10101 | P11 | 1 |
| 17 | 0b10111 | P15 | 1 |
| 5 | 0b00101 | P33 | 0 |
*4 Array 3 is for the mode
| HEX | Value |
|---|---|
| 0 | auto |
| 1 | eco |
| 2 | boost |
| 3 | electric |
| 4 | fan |
| 5 | holiday |
To write minus you need to count backward
| HEX | Value |
|---|---|
| FF | -1 |
| FE | -2 |
| FD | -3 |
| FC | -4 |
| FB | -5 |
| FA | -6 |
| ... | and so on |
*5 *** DISCLAIMER *** Warning, this information has been compiled by reverse engineering. I assume no liability for damages, errors or other problems. If you are not sure, don't do it!
if you want to write to the Heatpump you need to replace the first CC with CD, change one Parameter and recalc the CRC Sum. You need to send the complete string like CC received. You can also
code example in PHP
function CalculateChecksum(string $hex)
{
$bufLen = strlen($hex);
$sum_dec = 170; // Hex AA
for ($i=0; $i < $bufLen; $i+=2)
{
//echo substr($hex, $i, 2);
$sum_dec += hexdec(substr($hex, $i, 2));
}
$result = strtoupper(dechex(($sum_dec % 256)));
$this->SendDebug(__FUNCTION__, 'Calculate checksum for HEX: '.$hex." with result ". $result, 0);
return str_pad($result,2,"0", STR_PAD_LEFT);
}
Example usage:
CalculateChecksum('CD0115001E3C0A0007111EFB0333323737323E3E070441070202000000030001010A280A8C3E4B1E0F09195804FF00000202010000000000001508202BF9190C5A321400017F');
Result: A8 you need to send
CD0115001E3C0A0007111EFB0333323737323E3E070441070202000000030001010A280A8C3E4B1E0F09195804FF00000202010000000000001508202BF9190C5A321400017FA8
I write a litte module for symcon home automation -> https://github.com/lorbetzki/net.lorbetzki.daikin-ekhhe.git
Faster informations -> https://github.com/lorbetzki/Daikin-EKHHE/discussions/