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+---
+title: Prometheus Astro Tyr
+categories: [mounts]
+description: USB and TCP/IP control, setup and configuration for the Prometheus Astro Tyr harmonic-drive mount.
+thumbnail: ./tyr.webp
+---
+
+# Prometheus Astro Tyr
+
+Tyr is a harmonic-drive telescope mount manufactured by
+[Prometheus Astro](https://prometheusastro.com/). This dedicated INDI telescope
+driver supports USB serial and TCP/IP connections. Select **Prometheus Astro
+Tyr** in the telescope section of your Ekos equipment profile.
+
+## Supported features
+
+- Equatorial coordinates, GoTo, Sync, abort and pier side.
+- Manual axis movement, tracking on/off, Sidereal/Solar/Lunar/King tracking rates,
+  custom tracking rates and pulse guiding.
+- Home, Park and Unpark.
+- Shared manual/GoTo slew speed, expressed in degrees per second.
+- Refraction or pointing-model tracking compensation with one or both axes.
+- Saved RA/Dec motor settings, mount geometry, altitude and meridian limits,
+  backlash, Home offsets/input assignment and Auto-Home on boot.
+- Automatic meridian flip, pause at Home, preferred pier side and buzzer.
+- Manual firmware alignment sequence: star count, Start, Accept and Save.
+- Magicsee R1 Bluetooth enable/disable, discovery and controller selection.
+- AP and three station Wi-Fi profiles, DHCP/static addresses and new passwords.
+- Read-only controller uptime and last-reset diagnostics.
+
+Bluetooth and network configuration controls are shown only when the firmware
+advertises those capabilities. The driver does not expose unsupported focuser
+or PEC controls. It does not capture images or automatically plate-solve an
+alignment model.
+
+## Requirements and installation
+
+- INDI **2.2.5 or newer**.
+- CMake 3.16+, a C++17 compiler and `nlohmann_json` development headers 3.2+.
+- Linux is the validated platform. Other platforms/architectures are not yet
+  represented as tested by the manufacturer.
+- Tyr firmware with management protocol version 1 for USB. Firmware **v1.2.10
+  or later is required for TCP**. Boot diagnostics require v1.2.9 or later.
+
+Use the `indi-tyr` package if it is available from your distribution or INDI
+package repository. Inclusion in this source repository does not guarantee an
+immediate package release for every distribution.
+
+To build just the driver from an `indi-3rdparty` checkout on Ubuntu/Debian:
+
+```bash
+sudo apt install build-essential cmake ninja-build pkg-config \
+    libindi-dev indi-bin libnova-dev nlohmann-json3-dev python3
+cmake -S indi-tyr -B build-tyr -G Ninja -DCMAKE_BUILD_TYPE=Release
+cmake --build build-tyr --parallel
+ctest --test-dir build-tyr --output-on-failure
+sudo cmake --install build-tyr
+```
+
+Your selected package source must provide the required INDI version. No special
+Tyr udev rule is required for a normal CP2102 adapter. Your account needs serial
+access, normally membership of the distribution's serial-access group, such as
+`dialout` on Ubuntu. Log out and back in after changing group membership.
+
+## Launching the driver
+
+Ekos starts the driver through the equipment profile. To run an INDI server
+manually:
+
+~~~bash
+indiserver -v indi_tyr_telescope
+~~~
+
+The installed `indi_tyr.xml` registration file lets INDI clients discover the
+driver. Select Simulation in Options before connecting for a hardware-free test.
+
+## USB connection
+
+1. Power the mount from its normal power supply and connect its USB cable.
+2. In INDI Control Panel, open **Connection**, select **Serial**, select the
+   CP2102 device (usually `/dev/ttyUSB0`) and use **9600 baud**.
+3. Select **Connect** in Main Control. Wait for firmware startup if necessary.
+4. Read the reported firmware identity and the current mount settings.
+
+Only one service may own a given serial device. Close competing serial clients.
+Opening USB can reset some ESP32 adapter arrangements; the driver releases
+DTR/RTS and waits up to 30 seconds for startup. If Auto-Home on boot is enabled,
+a reset can initiate Home. Keep the rig clear during connection and startup.
+
+In a virtual machine, attach the CP2102 adapter to the guest first. USB capture
+and adapter reset wiring are separate from the INDI driver.
+
+## TCP/IP connection
+
+1. Connect your computer to the mount's access point or the LAN containing Tyr.
+2. In **Connection**, select **Network** and **TCP**.
+3. Enter the mount's IP address or hostname and its command port, normally
+   **9999**. Enter the actual address configured on your mount.
+4. Connect and confirm the Tyr identity and firmware version.
+
+The command port is separate from HTTP/web configuration and from the local
+Windows ASCOM Hub. UDP is not supported. Do not select the generic OnStep driver
+for this device profile. Firmware before v1.2.10 does not expose Tyr management
+commands on TCP. Keep polling below ten seconds, the mount's TCP idle timeout;
+the default driver polling interval is one second.
+
+## Site and time
+
+INDI longitude is east-positive, expressed from 0 to 360 degrees. The driver
+converts it to Tyr's west-positive convention when sending site coordinates.
+Set the observing location in Ekos and verify the latitude/longitude sent to Tyr.
+
+**Client offset (includes DST)** follows INDI's local-time convention.
+**Tyr UTC minus STANDARD time (no DST)** is a separate saved mount setting on
+Site Management. It uses the opposite sign and excludes daylight saving.
+
+For Athens, the Tyr setting is **-2 throughout the year**, while the client's
+offset can be +3 during summer. Do not enter -2 in the client field. UTC updates
+use the saved Tyr offset to compute local standard date/time; they do not replace
+it with the client's DST offset. Fractional-hour zones and date rollover are
+handled by the conversion.
+
+## Settings and operation
+
+Settings are read automatically on connection and after saves. **Read mount
+settings** refreshes all settings or a selected section; use it after changes
+from another interface.
+
+| Tab | Controls |
+| --- | --- |
+| Main/Motion | Coordinates, tracking, manual movement, pulse guiding and shared slew speed |
+| Site Management | UTC, location, Tyr standard-time offset and Park options |
+| Axes | RA/Dec configuration, firmware defaults versus saved settings and geometry |
+| Limits | Horizon/overhead, east/west meridian limits and backlash |
+| Home | Home offsets and Auto-Home on boot |
+| Meridian | Automatic flip, pause at Home, preferred pier side and buzzer |
+| Tracking | Tracking offsets |
+| Alignment/Tyr | Manual alignment star count, Start/Accept/Save and Continue Flip |
+| Bluetooth | R1 discovery/selection, enable/disable and current state |
+| Network | AP, station profiles, DHCP/static addresses and password changes |
+| Tyr | Firmware identity, live status, compensation, Home input assignment, refresh and restart |
+
+Stop movement and guiding before changing limits/backlash. Motor, Home and
+network edits also require tracking off. Requests that do not meet these
+conditions are rejected; the driver does not stop equipment automatically to
+apply configuration. Motor, geometry and network changes require a restart.
+Home-offset changes invalidate the mount's trusted Home reference.
+
+Wi-Fi edits remain pending until **Apply**. Blank password fields retain saved
+passwords. **Read Network** discards pending edits. Network saves use a transaction
+and abort on failure. Password inputs are not echoed in INDI properties or driver
+debug logs. Non-network multi-command saves can partially succeed if firmware
+rejects a later command; readback shows actual values and marks the save Alert.
+
+Home and alignment commands can move the mount. Check rig/cable clearance and
+observing limits first. Driver Restart is explicit and disconnects the driver.
+
+## Troubleshooting and support
+
+- **No connection:** check power, USB permissions or TCP address/command port,
+  exclusive device ownership and required firmware version.
+- **TCP drops:** retain a polling interval below ten seconds and check the LAN.
+- **Settings Alert:** check the mount's motion/tracking state and firmware error;
+  read settings again before retrying.
+- **Incorrect time:** verify the saved standard offset and the separate INDI
+  client offset; do not add DST to the Tyr setting.
+- **GoTo rejected:** inspect Park, altitude/meridian limits and mount status.
+  Do not bypass limits to force a rejected move.
+
+Enable INDI debug logging when requested by support, reproduce the issue, and
+include driver/firmware versions, connection type and the relevant error.
+Contact **support@prometheusastro.com** or use
+[Prometheus Astro support](https://prometheusastro.com/contact/).
+
+Firmware installation is outside this driver's scope. Use Tyr's supported USB
+installer/Control Center or the mount's web updater for OTA updates.
+
+## Validation
+
+Four automated tests cover simulation, serial telescope commands, serial
+configuration and TCP configuration/Sync. They use isolated profiles and emulated
+hardware, including fragmented TCP replies, firmware rejection, motion guards,
+network transaction rollback and password redaction.
+
+On 12 October 2026, the manufacturer reported that real-mount USB and TCP tests
+passed using INDI 0.3.0 and firmware v1.2.10. That hardware report is distinct
+from the automated checks. No ARM or macOS hardware results are claimed.
+
+## License
+
+The INDI driver is licensed under **GPL-2.0-or-later**. See its `COPYING` and
+`THIRD_PARTY.md` in the [driver source](https://github.com/indilib/indi-3rdparty/tree/master/indi-tyr). This licence applies to the INDI contribution and does not
+change the licensing of separate Tyr applications or firmware.
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+driver_name: Prometheus Astro Tyr
+manufacturer_name: Prometheus Astro
+categories: [mounts]
+website: https://prometheusastro.com/
+executable: indi_tyr_telescope
+platforms: Linux
+author: Prometheus Astro
+version: "0.3.0"
+connection: USB serial, TCP/IP