Toshiba Estia R32 serial communication

Hardware adapter

Hardware adapter for adjusting Toshiba AB protocol to 3.3V is taken from @issalig toshiba air conditioners project.
Note that A should by connected to positive and B to negative.

Schematic

Board

Board is designed to fit on a 4x6cm prototype board.

Microcontroller

Code is written to work on Arduino esp32 or Arduino esp8266.

Dependencies

• Arduino core (esp32 or esp8266)
• EspSoftwareSerial

Missing features

• cooling
• zone 2
• hot water boost
• anti bacteria
• frost protection
• commands ack

Config

I have 11kW model, so if there is default value depending on model 11kW is used.

config.h

#define SENSORS_DATA_TO_REQUEST "tc", "twi", "two", "tho", "wf", "lps", "te", "to", "td", "ts", "tl", "cmp", "fan1", "pmv", "hps"
#define TOSHIBA_ESTIA_MODEL 11    // 4kW, 6kW, 8kW, 11kW

Commands

Set mode

mode: auto, quiet*, night, heating, hot_water
onOff: 1 | 0

estiaSerial.setMode(std::string mode, uint8_t onOff);

* quiet mode must be enabled in controller

Set temperature

zone: heating, hot_water
temperature: for heating 20-65, for hot water 40-75

estiaSerial.setTemperature(std::string zone, uint8_t temperature);

Force defrost

Force defrost on next operation start (heating or hot water). onOff: 1 | 0

estiaSerial.forceDefrost(uint8_t onOff);

Request data

Request single data point

estiaSerial.requestData("twi");    // request data by name
estiaSerial.requestData(0x06);     // request data by code

Request multiple data points at once

Default sensors data to request is defined in config.h -> SENSORS_DATA_TO_REQUEST.
Data will be saved to estiaSerial.sensorData.

EstiaData::first = sensor name
EstiaData::second = { value, multiplier }
data value equal or below -200 is an error code

if (estiaSerial.requestSensorsData()) {    // request update for all data points
	for (auto& element : estiaSerial.sensorData) {
		Serial.printf("%s :", element.first);
		// data is error code skip multiplier
		if (element.second.value <= EstiaSerial::err_not_exist) {
			Serial.print(element.second.value);
		} else {
			Serial.print(element.second.value * element.second.multiplier);
		}
		Serial.println();
	}
}

It is possible to update only few sensors.

if (estiaSerial.requestSensorsData({"twi", "two", "wf"})) {
	for (auto& element : estiaSerial.sensorData) {    // request update for chosen data points
		Serial.printf("%s :", element.first);
		// data is error code skip multiplier
		if (element.second.value <= EstiaSerial::err_not_exist) {
			Serial.print(element.second.value);
		} else {
			Serial.print(element.second.value * element.second.multiplier);
		}
		Serial.println();
	}
}

Available data points

name	code	multiplier	unit	description
tc	0x04	x1	°C	condensedTemperature
twi	0x06	x1	°C	waterInletTemperature
two	0x07	x1	°C	waterOutletTemperature
tho	0x08	x1	°C	waterHeaterOutletTemperature
tfi	0x09	x1	°C	floorInletTemperature
ttw	0x0a	x1	°C	hotWaterTemperature
mix	0x0b	x1	step	mixingValvePosition
lps	0x0e	x1/10	kPa	lowPressure
sw_ver	0x0f	--		softVersion
ctrl_hw_temp	0x10	x1	°C	controlTemperatureHotWater
ctrl_zone1_temp	0x11	x1	°C	controlTemperatureZone1
ctrl_zone2_temp	0x12	x1	°C	controlTemperatureZone2
wf	0xc0	x10	l/min	water flow
te	0x60	x1	°C	heatExchangeTemperature
to	0x61	x1	°C	outsideTemperature
td	0x62	x1	°C	dischargeTemperature
ts	0x63	x1	°C	suctionTemperature
ths	0x65	x1	°C	heatSinkTemperature
ct	0x6a	x1/10	A	current
tl	0x6d	x1	°C	heatExchangerCoilTemperature
cmp	0x70	x1	Hz	compressorSpeed
fan1	0x72	x1	RPM	outdoorFan1RPM
fan2	0x73	x1	RPM	outdoorFan2RPM
pmv	0x74	x1/10	pls	outdoorPMVPosition
hps	0x7a	x1/10	kPa	Ps highPressure
hp_on_time	0xf0	x1/100	h	microComputerEnergizedAccumulationTime
hw_cmp_on_time	0xf1	x1/100	h	hotWaterCompressorONAccumulationTime
cool_cmp_on_time	0xf2	x1/100	h	coolingCompressorONAccumulationTime
heat_cmp_on_time	0xf3	x1/100	h	heatingCompressorONAccumulationTime
pump1_on_time	0xf4	x1/100	h	pump1ONAccumulationTime
hw_e_heater_on_time	0xf5	x1/100	h	hotWaterEHeaterAccumulationTime
backup_heater_on_time	0xf6	x1/100	h	backupEHeaterAccumulationTime
boost_heater_on_time	0xf7	x1/100	h	boosterEHeaterAccumulationTime

Sniff communication

Sniffer returns raw frames in hex e.g. a0 00 10 07 00 08 00 00 fe 00 8a 75 05

switch (estiaSerial.sniffer()) {
	case EstiaSerial::sniff_new_frame:
	case EstiaSerial::sniff_pending_frame:
		Serial.println(estiaSerial.getFrame());
		break;
}

Sniffer also decodes status frames. There is status data update flag available estiaSerial.newStatusData to indicate if data was updated.

if (estiaSerial.newStatusData) {
	StatusData data = estiaSerial.getStatusData();
	printStatusData(data);
}

RAW frames