Infinitude Compatibility Matrix

Infinitude Compatibility Matrix

Known-working combinations of thermostat hardware, firmware version, and Infinitude features. This is a community-maintained list — add your setup by editing this page.

Important Firmware Notice

Infinitude is not compatible with thermostat firmware versions on some newer models. Carrier changed the cloud protocol in newer firmware, breaking Infinitude's interception model. Do not update your thermostat past firmware 14.02 or 4.05 (version numbers differ depending on hardware) if you plan to use Infinitude.

If your thermostat has already been updated past 4.05, you cannot downgrade through normal means. See Issue #369 for discussion.

Thermostats

Carrier/Bryant Infinity Touch Controls

Model	Hardware	Firmware	Infinitude	SAM ASCII	RS485	Source	Notes
SYSTXCCITC01	SH7267, MRF24WB0MA WiFi	CESR131493-12	✅	✅	✅	wiki	Firmware download available
SYSTXCCITC01	SH7267, MRF24WB0MA WiFi	CESR131493-14.01	✅	✅	✅	wiki	Latest "A" hardware firmware. Download
SYSTXCCITC01-B	SH7269, WL1835 WiFi	CESR131493-14.02	✅	✅	✅	nebulous	Primary development target. Register map documented in docs/Register-Map.md
SYSTXCCITC01-B	SH7269, WL1835 WiFi	CESR131626-01.30	❓	❓	❓	wiki	"B" hardware firmware. Download
SYSTXCCITC01-B	SH7269, WL1835 WiFi	CESR131626-04.79	X	✅	✅	feisley	Latest software as of 2026-06. Does not support infinitude proxy but responds to SAM and SAM emulation.

The -B suffix indicates the updated hardware revision with a faster CPU (SH7269 at 266 MHz vs SH7267 at 144 MHz) and a Texas Instruments WL1835 WiFi module replacing the Microchip MRF24WB0MA. The Bryant equivalent is SYSTXBBECC01-B. Both revisions run the same firmware family (CESR131493) and are functionally identical from Infinitude's perspective.

Other Carrier/Bryant User Interfaces

Model	Firmware	Infinitude	Notes
SYSTXBBUID01-B	unknown	✅	User interface device, observed on bus at address 0x20
SYSTXCCUIZ01-B	unknown	❓	Infinity Zone Control / Zoning User Interface
SYSTXCCITW01	unknown	❓	WiFi Internet gateway variant

System Access Modules

Model	Firmware	RS485 Bus	ASCII Protocol	Source	Notes
SYSTXCCSAM01	CESR131379-03	✅	✅	nebulous	Primary SAM for development and testing. ASCII protocol fully documented in docs/SAM-ASCII-Protocol.md
SYSTXCCRCT01	—	❓	❓	Carrier spec	Listed as SAM-compatible in Carrier documentation
SYSTXNNRCT01	CESR131439-04	✅	✅	feisley	Tested by feisley and used for comparing native RS485 commands
SYSTXCCRWF01	—	❓	❓	Carrier spec	Listed as SAM-compatible in Carrier documentation

Equipment (Bus Devices)

These don't run Infinitude but coexist on the ABCD bus. Compatibility here means Infinitude correctly intercepts and relays their data.

Indoor Units

Model	Firmware	Registers Observed	Notes
59MN7B060C171114 (Variable Speed Furnace)	CESR131671-05	0104, 0302, 0303, 0307, 0402–040D, 0413, 041B, 0420	From Feisley captures (bus address 0x40)
58CVA110	CESR131516-24	0104, 030A	Variable speed furnace
355CAV / 58MVC100	unknown	unknown	Bryant 3-stage heat, variable fan
FE4ANF002 / FE4ANF003	unknown	unknown	Fan coil units

Outdoor Units

Model	Firmware	Registers Observed	Notes
25VNA824B0030050 (Variable Speed Heat Pump)	CESR131564-10	0104, 0302–0304, 0306–030E, 0310, 0311, 031F–0321, 0602–0625	From Feisley captures (bus address 0x52, class index 2)
24VNA948	CESR131564-09	0104, tables 01, 03, 06	Variable speed heat pump
264AN / 25HNB624A003	unknown	0104 only	Bryant — no register response beyond device info

Zone Controllers

Model	Firmware	Registers Observed	Notes
SYSTXCC4ZC01	CESR131331-01	0104, 0302, 030D, 0310, 0311, 0319, 3404	4-zone controller. Emulation support in CarBus::ZoneController. Documented in docs/feisley-captures/ZONE_CONTROLLER.md

Sensors

Model	Address	Notes
SYSTXCCSMS01	0x22	Infinity Smart Sensor (zone 2)
SYSTXCCSMS01-B	0x34	Infinity Smart Sensor (remote room sensor)

Network Interface Modules

Model	Address	Notes
SYSTXCCNIM01	0x80	Network Interface Module

Infinitude Feature Matrix by Firmware

Feature	CESR131493-12	CESR131493-14.01	CESR131493-14.02
Cloud interception	✅	✅	✅
Temperature control	✅	✅	✅
Schedule management	✅	✅	✅
Comfort profiles	✅	✅	✅
MQTT / Home Assistant	✅	✅	✅
SAM ASCII protocol	✅	✅	✅
RS485 bus monitoring	✅	✅	✅
Zone controller emulation	—	—	✅

Adding Your Setup

To add your configuration, edit this page with:

1. Thermostat model — found in Settings → About on the thermostat, or from register 0104 (model field)
2. Firmware version — the CESR number from Settings → About, or register 0104 (software field)
3. What works — mark features with ✅ (working), ❌ (broken), or ❓ (untested)
4. Notes — anything unusual about your setup (bridge type, serial adapter, Docker vs bare metal, etc.)

Firmware versions can be read from the bus using:

CarBus::Frame register 0104 → device_info.software

Or from Infinitude's web UI status page.