OptionalPCB.md

Optional PCB:

Optional PCB is also connected to HP via the CN-CNT ( in case using it and CZ-TAW1 ,Optional PCB is connected to HP , and on Optional PCB there is another CN-CNT to connect CZ-TAW1). In this way Optional PCB communicate with HP in similar way to CZ-TAW1 - Next to(between) standard Magic Packets there specific commands from Optional PCB to HP ,and next to (between) answers from HP there is a answer/confirmation to Optional PCB.

Optional PCB emulation support:

Recent firmware allows (experimental) support for optional PCB emulation. This allows you to set SmartGrid or Demand Control values without having the optional pcb installed. Also you can send the temperatures normally connected to that board to the heatpump.

You can publish mqtt messages towards the 'topic base/commands/pcb_topic', so for example "panasonic_heat_pump/commands/SetSolarTemp". For temperatures you just send the real temperature (the hexadecimal value will be calculated for your). For SmartGrid and Demand control you send the decimal representation of the hex value you want to send (see below for the possible hex values).

Remark 1: You need to set in HP Service settings Optional PCB to YES ,and appropriate function as well to have effect in sending MQTT topics.

Remark 2: Turning on Optional PCB in HP's options will couse ,that Room Thermo 1 input will not work anymore. It is now possible to use PCB topics "SetExternalThermostat1State" (with substitute Room Thermo 1 now) and "SetExternalThermostat2State".

Remark 3: Setting in HP Service settings Optional PCB to YES gives expectation ,that Optional PCB emulator ( HeishaMon) will sent continuously Optional PCB Set Command. When communication disappear (for around 40s) HP generates H74 error and switches off to StandBy. So ensure continiues communication is very important , be aware during switch off , factory default of HeishaMon , or similar action.

Remark 4: If you enable optional pcb emulation the HeishaMon not boot into a wifi config hotspot if it can not connect to your previously configured wifi during boot. Also during wifi failures it will keep running and try to reconnect to the wifi instead of rebooting into wifi hotspotconfig. It is important to send often optional pcb commands to the heatpump and therefore it can not react on wifi failures like that. So if you have a running wifi and heishamon and need to reconfigure your wifi ssid or password you first need to factory reset your heishamon. Or if you need to reconfigure your HeishaMon in such situation you need the double reset factory reset trick to clear the config on the Heishamon.

Set command byte decrypt:

PCB Topic	Topic value	Byte#	Possible Value	Value decrypt	Value Description
	-	00	F1		Header
	-	01	11	Data length ( Packet length = Data length + 3 )	Header
	-	02	01		Header
	-	03	50		Header
	-	04	00		Acknowledge for Z1/Z2/Pool Water Pump & Mixing valves state
	-	05	00		Acknowledge for Alarm
SetHeatCoolMode SetCompressorState SetSmartGridMode SetExternalThermostat1State SetExternalThermostat2State	0/1 0/1 0/1/2/3 0/1/2/3 0/1/2/3	06	40	1st bit = Heat/Cool 2nd bit = Compressor state 3rd/4th bit == SmartGrid Mode (00 = normal, 10 = HP/DHW off, 01 = Capacity 1, 11 = Capacity 2) 5th/6th bit = Thermostat 1 (00 = no demand, 01 = cool demand, 10 = heat demand, 11 = heat and cool demand) 7th/8th bit = Thermostat 2 (00 = no demand, 01 = cool demand, 10 = heat demand, 11 = heat and cool demand)	SG ready values , External Compressor SW , Heat/Cool SW, Thermostat 1/2
SetPoolTemp	Temp [C]	07	FF	NTC 6,5kOhm resistance characteristic value	Temp. Pool
SetBufferTemp	Temp [C]	08	FF	NTC 6,5kOhm resistance characteristic value	Temp. Buffer
	-	09	E5 but also93,92,91 (90) ,A2		?
SetZ1RoomTemp	Temp [C]	10	FF	NTC 6,5kOhm resistance characteristic value	Temp. Z1_Room
SetZ2RoomTemp	Temp [C]	11	FF	NTC 6,5kOhm resistance characteristic value	Temp. Z2_Room
	-	12	00		0 byte
SetSolarTemp	Temp [C]	13	FF	NTC 6,5kOhm resistance characteristic value	Temp. Solar
SetDemandControl	from 43 -5% to 234 - 100%	14	EA	HEX: EB-100% ,B8 - 75% ,85 -50%,52 - 25% ,2B - 5%	Demand Control
SetZ2WaterTemp	Temp [C]	15	FF	NTC 6,5kOhm resistance characteristic value	Temp. Z2_Water
SetZ1WaterTemp	Temp [C]	16	FF	NTC 6,5kOhm resistance characteristic value	Temp. Z1_Water
	-	17	00		0 byte
	-	18	00		0 byte
	-	19	2C	CHECKSUM

Answer/confirmation from HP to Optional PCB

Answer/confirmation contains also steering parameters :

71 11 01 50 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 2D

Byte#	Possible Value	Value decrypt	Value Description
04	C4	1st bit = Z1 Water pump 2nd bit = Z1 Mixing Valve + 3rd bit = Z1 Mixing Valve - 4th bit = Z2 Water pump 5th bit = Z2 Mixing Valve + 6th bit = Z2 Mixing Valve - 7th bit = Pool Water pump 8th bit = Solar Water pump
05	01	00 - No Alarm 01 - Alarm

NTC 6,5kOhm characteristic:

Values are direct measurement of NTC thermistor conected to Optional PCB. It can be approximate by function : Uref * (RT / (Rf + RT)) where Uref = 255 and Rf=6480. RT is calculated as R25 * exp(constant * (1 / (temp + K) - 1 / (T25 + K))) where R25 = 6340, T25=25, K=273.15, constant=3695 and temp the input temperature.

Exact values table

HEX Val.	Temp [C]	HEX Val.	Temp [C]	Hex Val.	Temp [C]	Hex Val.	Temp [C]
00	120	40	53	80	24	C0	0
01	120	41	53	81	24	C1	0
02	120	42	52	82	24	C2	-1
03	120	43	51	83	23	C3	-1
04	120	44	51	84	23	C4	-2
05	120	45	50	85	22	C5	-2
06	120	46	50	86	22	C6	-3
07	120	47	49	87	22	C7	-3
08	120	48	49	88	21	C8	-4
09	120	49	48	89	21	C9	-4
0A	120	4A	48	8A	21	CA	-4
0B	120	4B	47	8B	20	CB	-5
0C	117	4C	47	8C	20	CC	-5
0D	114	4D	46	8D	19	CD	-6
0E	111	4E	45	8E	19	CE	-6
0F	108	4F	45	8F	19	CF	-7
10	106	50	44	90	18	D0	-7
11	103	51	44	91	18	D1	-8
12	101	52	44	92	18	D2	-8
13	99	53	43	93	17	D3	-9
14	97	54	43	94	17	D4	-9
15	95	55	42	95	17	D5	-10
16	93	56	42	96	16	D6	-10
17	92	57	41	97	16	D7	-11
18	90	58	41	98	15	D8	-12
19	88	59	40	99	15	D9	-12
1A	87	5A	40	9A	15	DA	-13
1B	86	5B	39	9B	14	DB	-13
1C	84	5C	39	9C	14	DC	-14
1D	83	5D	38	9D	14	DD	-15
1E	82	5E	38	9E	13	DE	-15
1F	80	5F	38	9F	13	DF	-16
20	79	60	37	A0	12	E0	-16
21	78	61	37	A1	12	E1	-17
22	77	62	36	A2	12	E2	-18
23	76	63	36	A3	11	E3	-18
24	75	64	35	A4	11	E4	-19
25	74	65	35	A5	11	E5	-20
26	73	66	35	A6	10	E6	-21
27	72	67	34	A7	10	E7	-21
28	71	68	34	A8	9	E8	-22
29	70	69	33	A9	9	E9	-23
2A	69	6A	33	AA	9	EA	-24
2B	68	6B	32	AB	8	EB	-25
2C	67	6C	32	AC	8	EC	-26
2D	66	6D	32	AD	8	ED	-27
2E	66	6E	31	AE	7	EE	-28
2F	65	6F	31	AF	7	EF	-29
30	64	70	30	B0	6	F0	-30
31	63	71	30	B1	6	F1	-31
32	62	72	30	B2	6	F2	-32
33	62	73	29	B3	5	F3	-33
34	61	74	29	B4	5	F4	-35
35	60	75	28	B5	4	F5	-36
36	60	76	28	B6	4	F6	-38
37	59	77	28	B7	4	F7	-40
38	58	78	27	B8	3	F8	-41
39	58	79	27	B9	3	F9	-44
3A	57	7A	27	BA	2	FA	-46
3B	56	7B	26	BB	2	FB	-49
3C	56	7C	26	BC	2	FC	-53
3D	55	7D	25	BD	1	FD	-57
3E	54	7E	25	BE	1	FE	-64
3F	54	7F	25	BF	0	FF	-78

To do:

• Byte #9 decode ( probably connected with Buffer)