TECH Sterowniki ST-340 V2 DRO (HRV controller)

Status: Vendor Confirmed · Register points: 62 · Transports: Modbus RTU

A curated ModDef profile for the TECH Sterowniki ST-340 V2 DRO (HRV controller). Import it as tech.st340v2-dro or load the .moddef.yaml directly.

Connect to one over Web Serial and watch its values live in the device dashboard.

Usage

Load the profile, bind a transport, and read a point by name. The runtime applies the offset, scaling, byte order, and sentinels from the definition.

Go

doc, _ := moddef.Load("tech-st340v2-dro.moddef.yaml")
dev, _ := client.New(doc, "tech-st340v2-dro", transport) // your modbus.Transport
v, _ := dev.ReadPoint(ctx, "temperature_intake")
fmt.Println(v)

TypeScript

import {Device} from '@moddef/core';
import {loadDocument} from '@moddef/core/node';

const doc = await loadDocument('tech-st340v2-dro.moddef.yaml');
const dev = Device.create(doc, 'tech-st340v2-dro', transport);
console.log(await dev.readPoint('temperature_intake'));

Rust

let doc = moddef_core::load("tech-st340v2-dro.moddef.yaml")?;
let mut dev = Device::new(&doc, Some("tech-st340v2-dro"), transport)?;
let v = dev.read_point("temperature_intake").await?;

Python

from moddef import Device, load
from moddef.pymodbus import Options, PymodbusTransport

doc = load("tech-st340v2-dro.moddef.yaml")
transport = await PymodbusTransport.tcp("192.168.1.50", options=Options())
dev = Device.create(doc, "tech-st340v2-dro", transport)
print(await dev.read_point("temperature_intake"))

C

md_doc_t doc;
md_doc_init(&doc, flash_ptr, flash_len);        /* zero-copy view */

md_dev_t dev;
md_dev_init(&dev, &doc, MD_STR("tech-st340v2-dro"), &transport);

md_value_t v;
md_dev_read(&dev, MD_STR("temperature_intake"), &v);

C++

auto doc = moddef::Document::view(flash_bytes).value();   // zero-copy over flash
auto dev = moddef::Device::open(doc, "tech-st340v2-dro", transport).value();

if (auto v = dev->read("temperature_intake"); v)
    std::cout << v->to_string() << '\n';

Commands

Multi-step register procedures (spec §11.7) this profile defines — write params, arm a trigger, poll for completion, then read the result. Run one with your language's command executor (RunCommand, runCommand, run_command, or md_cmd_begin/md_cmd_tick in C/C++).

write_weekly_program — Write One Day's Weekly Program

Set the five zone boundaries and their fan speed steps for one day of the week. Selects the day in register 110, then writes the four movable zone start times (zone 0 is fixed at midnight) and the five fan steps. Start times are minutes from midnight on a 15-minute grid and must stay inside the per-zone ranges the manual gives, which overlap deliberately: zone 1 is 15-1380, zone 2 is 30-1395, zone 3 is 45-1410 and zone 4 is 60-1425.

Params

Field	Type	Required
day	enum weekday	yes
zone1_start	UINT32	yes
zone2_start	UINT32	yes
zone3_start	UINT32	yes
zone4_start	UINT32	yes
zone0_fan_step	enum fan_step	yes
zone1_fan_step	enum fan_step	yes
zone2_fan_step	enum fan_step	yes
zone3_fan_step	enum fan_step	yes
zone4_fan_step	enum fan_step	yes

Results

Field	Type
day	—
zone1_start	UINT32
zone2_start	UINT32
zone3_start	UINT32
zone4_start	UINT32

read_weekly_program — Read One Day's Weekly Program

Read back the five zone boundaries and fan speed steps for one day of the week. Selects the day in register 110, then reads registers 111-120. Needed because the zone registers on their own do not say which day they belong to.

Params

Field	Type	Required
day	enum weekday	yes

Results

Field	Type
zone0_start	UINT32
zone1_start	UINT32
zone2_start	UINT32
zone3_start	UINT32
zone4_start	UINT32
zone0_fan_step	—
zone1_fan_step	—
zone2_fan_step	—
zone3_fan_step	—
zone4_fan_step	—

Measurands

The 3 semantic quantities this device reports, each linked to the measurand catalog. Query a device by measurand instead of a raw point when you want portable code.

Base quantity	Name	Unit	Description
temperature	Temperature	degC	Temperature; qualify with location (INTERNAL, EXTERNAL, ...)
device_status	Device Status	undefined	Overall device operating status (enum)
alarm_status	Alarm Status	undefined	Alarm state (enum or flag set)

Source

• Profile: hvac/tech-st340v2-dro/tech-st340v2-dro.moddef.yaml
• Register map: vendor documentation