Acoustics & Positioning
S2C acoustic modems and positioning solutions
Family overview
EvoLogics’ S2C family of underwater acoustic modems and positioning products for subsea communication and tracking.
Explore productAcoustics & Positioning
PRO 18/34
PRO 18/34 acoustic modem from EvoLogics, documented on the manufacturer model page for full-duplex S2C communication and underwater positioning.
The PRO 18/34 modem delivers full-duplex underwater communication and simultaneous positioning with EvoLogics S2C technology. It is documented for up to 13.9 kbit/s and approximately 2000 m in typical field applications.
Product · Reference MOD-EV-PRO-18-34
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Benefits
- PRO form factor and configuration documented by EvoLogics.
- Model-specific 18 - 34 kHz acoustic band.
- Model-specific horizontally omnidirectional transducer pattern.
Applications
- Subsea communication
- Underwater positioning
- ROV, AUV and sensor-network integration
Key features
- PRO form factor for mid-range underwater links.
- 18 - 34 kHz acoustic band with horizontally omnidirectional coverage.
- Communication and positioning in one modem platform.
Technical overview
EvoLogics presents PRO 18/34 as a distinct S2C modem model. Configuration, housing, depth and add-on choices remain quotation-dependent where the manufacturer marks them as options.
Technical details
General
- Speed range
- Fast short- and mid-range devices
- Operating range
- Mid-range
- Transducer beam pattern
- horizontally omnidirectional
- Frequency band
- 18 - 34 kHz
- Acoustic connection
- up to 13.9 kbit/s
Connection
- Bit error rate
- less than 10⁻¹⁰
- Internal data buffer
- 1 MB, configurable
- Host interface
- Ethernet or RS-232
- Interface connector
- Up to 4 connectors; Ethernet and serial combinations
- Serial option
- RS-232 can be replaced by RS-422 on request
Positioning
- Slant range precision
- 0.01 m
- USBL values
- Not separately listed for this non-USBL model
Power
- Stand-by consumption
- 2.5 mW
- Listen mode
- 5 - 285 mW; depends on settings
- Receive mode
- 0.8 W
- Maximum output power
- up to 65 W
- Maximum transmit source level
- 185 dB re 1 µPa @ 1 m
Power supply
- External supply
- 24 VDC or 12 VDC
- Internal battery
- Rechargeable NiMH or Li-ion battery, up to 342.8 Wh where configured
Housing
- Operating depth
- Base/hemi: Delrin 200 m; aluminium/stainless steel 2000 m; titanium/OEM according to variant (up to 6000 m for hemi/deep)
- Reference dimensions and weight
- Ø 110x178 mm; total length 265 mm; 2500/400 g dry/wet
Configuration options
Cable-Mounted TransducerBuild type
The transducer connects to the modem unit with a cable for flexible placement away from noise sources.
Technical details: Wet-mateable connector; standard cable length 1.5 m, other lengths on request.
Applications: UUV platforms, sensor stations and infrastructure
Compatibility: PRO, PRO USBL, MINI and TINY
OEM-VersionBuild type
Housing-free modem build with separate electronics and a cable-mounted transducer for third-party integration.
Technical details: Optional wet-mateable connector; standard cable length 1.5 m, other lengths on request.
Applications: UUV platforms and integrated systems
Compatibility: PRO, PRO USBL, MINI and TINY
Full Ocean DepthBuild type
A full-ocean-depth modem build is available for selected models by special request.
Technical details: Depth rating 10,000+ m; longer lead time due to additional testing and quality control.
Applications: Deep-sea research and extreme-environment operations
Compatibility: PRO, PRO USBL, MINI and TINY; selected models
Wake-Up ModulePower management
Low-power sleep and wake-up control based on acoustic signals or data-interface input.
Technical details: Two-connector version is available for PRO and PRO USBL base models; not compatible with Ethernet interfaces.
Applications: Power saving for long-term deployments
Compatibility: PRO, PRO USBL, MINI and TINY
Advanced Timekeeping ModulePositioning / R&D
Precise modem timekeeping with 1 PPS input and optional CSAC or OCXO clock.
Technical details: Supports synchronized modem operation and precise timing for LBL and research applications.
Applications: Time synchronization, positioning and protocol research
Compatibility: PRO, PRO USBL, MINI and TINY
SDM ModeResearch and development
Firmware add-on for user-defined acoustic waveforms and configurable reference triggers.
Technical details: Complements the standard S2C protocol without removing base modem capabilities.
Applications: R&D on modulation and communication protocols
Compatibility: PRO, PRO USBL, MINI and TINY
Firmware SandboxResearch and development
Open developer environment for custom software running onboard while retaining modem functionality.
Technical details: GNU/Linux container based on Angstrom Distribution with scripting and C/C++ toolchain support.
Applications: Custom subsea applications and embedded integration
Compatibility: PRO, PRO USBL, MINI and TINY
Pressure SensorPositioning
Measures water pressure for depth information, positioning accuracy and sensor-data georeferencing.
Technical details: Available depth ratings 50, 100, 200, 500, 2000, 6000, 8000 and 10000 m; accuracy 0.05% of depth rating.
Applications: UUV navigation and georeferenced subsea data
Compatibility: PRO and PRO USBL
Power SwitchPower management
Supplies power to up to three external instruments and switches them by modem command.
Applications: Power management and remote control
Compatibility: PRO and PRO USBL
Acoustic Release DeviceRelease and recovery
Acoustic release mechanism for recovering submerged assets to the surface.
Technical details: Integrated or cable-mounted design; depth ratings down to 6000 m, full-ocean-depth option by special request.
Applications: Seafloor sensor stations and positioning nodes
Compatibility: PRO and PRO USBL
OptocouplerExternal instrument control
Software-configurable trigger pulse for external instruments activated by acoustic command.
Technical details: One or two outputs depending on add-on and connector combination; maximum current 10 mA.
Applications: Remote activation of sensors, actuators, lights and cameras
Compatibility: PRO and PRO USBL
JANUSInteroperability
Interoperability with third-party acoustic devices using the NATO ANEP-87 JANUS protocol.
Technical details: Band A is available for 7/17 and 7/17 dir; Band C is available for 18/34, 18/34 deep and 18/34 hemi. Positioning data is computed from S2C only.
Applications: Mixed-vendor subsea networks
Compatibility: PRO and PRO USBL selected models
Compatibility and naming
Before mid-2025, this model was offered as S2C R 18/34. EvoLogics states that the current model remains acoustically compatible with the existing 18-34 S2C devices.
Acoustic performance notice
EvoLogics states that listed bitrate and operating range are upper limits measured under optimal acoustic conditions. Actual performance depends on the environment, sound-velocity profile, ambient noise, multipath, installation and transducer placement.
Specifications
| Frequency band | 18 - 34 kHz |
|---|---|
| Transducer beam pattern | horizontally omnidirectional |
Accessories & payload options
Options are selected for your application. Included equipment, interfaces and compatibility are confirmed in your quotation.
Connecting cables and wiring options
Mounting accessories
Product advice
Let’s discuss your requirements
Tell us about your application, operating conditions and preferred configuration.
These links open your email app. Send the email to submit your enquiry; demonstration dates and configuration are confirmed by ROVITEC.
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