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EvoLogics S2C M mini Modems

S2C M mini Modems
S2C M "mini" modems compared to S2C R 48/78 (far left)
S2C M mini Modems
S2C M HS (left) and S2C M HS with cable-mounted transducer
S2C M mini Modems
S2C M OEM mini-modem without housing

S2C M Mini Modems

The S2C M series of "mini-modems", a product line designed for size- and weight-sensitive applications, is ideal for integration with modern UUVs.

S2C M modems are fully compatible with S2C R Modem, USBL and LBL ranges. They can extend existing infrastructure and seamlessly integrate into EvoLogics navigation and positioning systems.

Any S2C M "mini" Modem can be supplied with a cable mounted transducer (up to 1.5 m cable length) to simplify system integration for UUVs or diver tracking systems.

For easier system integration, all S2C M "mini" Modems are available in OEM versions without housing.


  • Communication and positioning for AUVs and ROVs
  • Diver tracking systems
  • Size- and weight-sensitive applications
  • High-speed communication in adverse conditions

Directivity Patterns

 S2CM HS Underwater Acoustic Modem  S2CM 48/78 Underwater Acoustic Modem
S2CM HS Directivity PatternS2CM 48/78 Directivity Pattern
 S2CM 42/65 Underwater Acoustic Modem  S2CM 18/34 Underwater Acoustic Modem
S2CM 42/65 Directivity PatternS2CM 18/34 Directivity Pattern

Data Sheets

M-Series Underwater Acoustic Modems Product Information, pdf

S2CM-HS High-Speed Underwater Acoustic Modem Product Information, pdf

Contact EvoLogics for more information!


Operating Depth 200 m, Delrin housing
2000 m Stainless Steel housing
Operating Range 300 m, S2CM HS
1000 m, S2CM 48/78
1000 m, S2CM 42/65
3500 m, S2CM 18/34
Frequency Band 120 - 200 kHz, S2CM HS
48 - 78 kHz, S2CM 48/78
42 - 65 kHz, S2CM 42/65
18 - 34 kHz, S2CM 18/34
Transducer Beam Pattern omnidirectional, S2CM HS
horizontally omnidirectional, S2CM 48/78
wide-angle (100 degrees), S2CM 42/65
horizontally omnidirectional, S2CM 18/34
Acoustic Connection up to 62.5 kbit/s, S2CM HS
up to 31.2 kbit/s, S2CM 48/78
up to 31.2 kbit/s, S2CM 42/65
up to 13.9 kbit/s, S2CM 18/34
Bit Error Rate less than 10-10
Internal Data Buffer 1 MB, configurable
Host Interface [1] Ethernet or RS-232
Interface Connector 1 SubConn® Metal Shell1500 Series
Power Consumption Stand-by Mode
S2CM 48/78, S2CM 42/65, S2CM 18/34: 2.5 mW
S2CM HS: 0.5 mW
Listen Mode[2]: 5 - 285 mW
Receive Mode[3]: 0.8 W
Transmit Mode, max. available
S2CM HS: 8.5 W
S2CM 48/78: 55 W
S2CM 42/65: 35 W
S2CM 18/34: 55 W
Power Supply[4] External 24 VDC (12 VDC, 300 VDC options)
Dimensions[5] Housing ø63 mm x 235 mm
Total length:
310 mm, S2CM HS
310 mm, S2CM 48/78
300 mm, S2CM 42/65
310 mm, S2CM 18/34
Weight, dry/wet Delrin housing:
1120/330 g, S2CM HS
1120/330 g, S2CM 48/78
1210/420 g, S2CM 42/65
1265/480 g, S2CM 18/34

Stainless Steel:
2760/1970 g, S2CM 48/78
2850/2060 g, S2CM 42/65
2910/2120 g, S2CM 18/34

[1] See the S2CM-Series Underwater Acoustic Modems Product Information for available standard interface combinations.

[2] User-configurable Listen Mode is only available with a Wake-Up module installed. Power consumption in Listen Mode depends on Listen Mode settings. Power consumption increases by 250 mW with the Wake-Up Module installed.

[3] Power consumption for the RS-232 interface option. Add 500 mW for the Ethernet interface option.

[4] Contact EvoLogics for more information on power supply options.

[5] Dimensions of a Delrin housing, other builds are slightly larger.

Specifications subject to change without notice.