Sealevel Serial, I/O, and Embedded Computing Solutions

We supply Sealevel Systems' high-reliability serial, digital I/O, and embedded computing products built for long-term operation in harsh and highly regulated environments.

Their range includes PCIe and PCI serial cards, Ethernet-to-serial devices, industrial I/O modules, and fanless embedded computers. Built for use in military, medical, and industrial environments, Sealevel products are known for rock-solid performance, extended lifecycle support, and compliance with strict operational standards.

Explore our Sealevel product range or get in touch for specialist advice.

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Showing 180 of 426 Sealevel Products items

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Sealevel TB34-2-ROHS

2x Terminal Block - DB9 Female to 5 Screw Terminals (RS-422/485)

Sealevel TB10-ROHS

Terminal Block Kit: IDC40 to 4x DB9 Male Connectors

Sealevel TB08-KT-ROHS

Terminal Block Kit: HD44 Male to 28 Screw Terminals

Sealevel TB07-KT-ROHS

Terminal Block Kit: 50 Pin Header (IDC Ribbon Cable) to Screw Terminals

Sealevel 3541-KT

4 Port RS-232/422/485 PC/104 Serial Card Kit (C4.104-ULTRA Kit)

Sealevel DB116-ROHS

DB9 Male to RJ45 - Preconfigured for 4161/4163 (RS-232)

Sealevel DB113-ROHS

DB9 Male to DB9 Female Low Profile Null Modem Adapter

Sealevel DB112-ROHS

DB9 Female to RJ45 - Preconfigured for 7107 (RS-485)

Sealevel DB111-ROHS

DB9 Female to RJ45 Modular Adapter (RS-485 Pinout) for SeaI/O Modules

Sealevel DB109-ROHS

DB9 Female to RJ45 Modular Adapter (RS-232 Pinout) for SeaI/O Modules

Sealevel DB104-ROHS

DB25 Female (RS-422) to DB9 Female (Opto 22 Optomux) Converter

Sealevel DB103-ROHS

DB9 Female (RS-422) to DB9 Female (Opto 22 Optomux) Converter

3 options available

Sealevel 7161 Series

16 Port RS-232 PCI Serial Card

2 options available

Sealevel 7106e Series

1 Port RS-232/422/485/530 Low Profile PCI Express Asynchronous Serial Card

From £229.00 (exc. VAT)

2 options available

Sealevel 7106 Series

1 Port RS-232/422/485/530 Low Profile PCI Serial Card

From £437.00 (exc. VAT)

4 options available

Sealevel 7104 Series

1 Port RS-232 Low Profile PCI Serial Card

From £445.00 (exc. VAT)

1 option available

Sealevel 580PoE Series

Ethernet Modbus TCP to 32 Isolated Dry-Contact Inputs

From £637.50 (exc. VAT)

1 option available

Sealevel 580E Series

Ethernet Modbus TCP to 32 Isolated Dry-Contact Inputs

From £637.50 (exc. VAT)

1 option available

Sealevel 570U Series

USB Modbus RTU to 8 Analog Input – 8 Isolated Digital Input/8 Form C Relay Output Adapter

1 option available

Sealevel 540U Series

USB Modbus RTU to 32 Open-Collector Output Adapter

1 option available

Sealevel 540U-OEM Series

USB Modbus RTU to 32 Open-Collector Output OEM Board

1 option available

Sealevel 540S Series

RS-232 Modbus RTU to 32 Open-Collector Output Adapter

From £378.00 (exc. VAT)

1 option available

Sealevel 540S-OEM Series

RS-232 Modbus RTU to 32 Open-Collector Output OEM Board

From £366.00 (exc. VAT)

1 option available

Sealevel 540N Series

32 Open-Collector Output SeaI/O Expansion Module

From £378.00 (exc. VAT)

1 option available

Sealevel 540M Series

RS-485 Modbus RTU to 32 Open-Collector Output Adapter

From £378.00 (exc. VAT)

1 option available

Sealevel 540M-OEM Series

RS-485 Modbus RTU to 32 Open-Collector Output OEM Board

From £366.00 (exc. VAT)

1 option available

Sealevel 540E Series

Ethernet Modbus TCP to 32 Open-Collector Output Adapter

From £453.00 (exc. VAT)

1 option available

Sealevel 540E-OEM Series

Ethernet Modbus TCP to 32 Open-Collector Output OEM Board

From £439.50 (exc. VAT)

1 option available

Sealevel 5402e Series

4 Port RS-232/422/485/530/530A/V.35 PCI Express Synchronous Serial Card

From £1,473.00 (exc. VAT)

1 option available

Sealevel 5402 Series

4 Port RS-232/422/485/530/530/V.35 Synchronous Serial PCI Card

From £1,161.50 (exc. VAT)

1 option available

Sealevel 530W Series

Wireless 802.11b/g Modbus TCP to 16 Isolated Digital Input/16 Open-Collector Output Adapter

From £526.50 (exc. VAT)

1 option available

Sealevel 530U Series

USB Modbus RTU to 16 Isolated Digital Input/16 Open-Collector Output Adapter

1 option available

Sealevel 530U-OEM Series

USB Modbus RTU to 16 Isolated Digital Input/16 Open-Collector Output OEM Board

1 option available

Sealevel 530S Series

RS-232 Modbus RTU to 16 Isolated Digital Input/16 Open-Collector Output Adapter

From £428.50 (exc. VAT)

1 option available

Sealevel 530S-OEM Series

RS-232 Modbus RTU to 16 Isolated Digital Input/16 Open-Collector Output OEM Board

From £415.00 (exc. VAT)

1 option available

Sealevel 530N Series

16 Isolated Digital Input/16 Open-Collector Output SeaI/O Expansion Module

From £428.50 (exc. VAT)

1 option available

Sealevel 530M Series

RS-485 Modbus RTU to 16 Isolated Digital Input/16 Open-Collector Output Adapter

From £428.50 (exc. VAT)

1 option available

Sealevel 530M-OEM Series

RS-485 Modbus RTU to 16 Isolated Digital Input/16 Open-Collector Output OEM Board

From £415.00 (exc. VAT)

1 option available

Sealevel 530E Series

Ethernet Modbus TCP to 16 Isolated Digital Input/16 Open-Collector Output Adapter

From £502.00 (exc. VAT)

1 option available

Sealevel 530E-OEM Series

Ethernet Modbus TCP to 16 Isolated Digital Input/16 Open-Collector Output OEM Board

From £489.00 (exc. VAT)

1 option available

Sealevel 520W Series

Wireless 802.11b/g Modbus TCP to 8 Isolated Digital Input/8 High Current Form C Relay Output Adapter

From £378.00 (exc. VAT)

1 option available

Sealevel 520U Series

USB Modbus RTU to 8 Isolated Digital Input/8 High Current Form C Relay Output Adapter

1 option available

Sealevel 520U-OEM Series

USB Modbus RTU to 8 Isolated Digital Input/8 High Current Form C Relay Output OEM Board

1 option available

Sealevel 520S Series

RS-232 Modbus RTU to 8 Isolated Digital Input/8 High Current Form C Relay Output Adapter

From £280.00 (exc. VAT)

1 option available

Sealevel 520S-OEM Series

RS-232 Modbus RTU to 8 Isolated Digital Input/8 High Current Form C Relay Output OEM Board

From £266.50 (exc. VAT)

1 option available

Sealevel 520M Series

RS-485 Modbus RTU to 8 Isolated Digital Input/8 High Current Form C Relay Output Adapter

From £280.00 (exc. VAT)

1 option available

Sealevel 520M-OEM Series

RS-485 Modbus RTU to 8 Isolated Digital Input/8 High Current Form C Relay Output OEM Board

From £266.50 (exc. VAT)

1 option available

Sealevel 520E-OEM Series

Ethernet Modbus TCP to 8 Isolated Digital Input/8 High Current Form C Relay Output OEM Board

From £340.50 (exc. VAT)

2 options available

Sealevel 5104e Series

1 Port RS-232/422/485/530/530A/V.35 Low Profile PCI Express Synchronous Serial Card

From £584.50 (exc. VAT)

2 options available

Sealevel 5104 Series

1 Port RS-232/422/485/530/530A/V.35 Low Profile PCI Synchronous Serial Card

2 options available

Sealevel 5103e Series

1 Port RS-232 Low Profile PCI Express Synchronous Serial Card

From £453.50 (exc. VAT)

2 options available

Sealevel 5103 Series

1 Port RS-232 Low Profile PCI Synchronous Serial Card

2 options available

Sealevel 5102e Series

1 Port RS-232/422/485/530/530A/V.35 Low Profile PCI Express Synchronous Serial Card

From £534.00 (exc. VAT)

2 options available

Sealevel 5102 Series

1 Port RS-232/422/485/530/530A/V.35 Low Profile PCI Synchronous Serial Card

1 option available

Sealevel 470U Series

USB Modbus RTU to 16 Analog Input/2 Analog Output – 8 Isolated Digital Input/8 Digital Output Adapter

1 option available

Sealevel 470U-OEM Series

USB Modbus RTU to 16 Analog Input/2 Analog Output – 8 Isolated Digital Input/8 Digital Output OEM Board

1 option available

Sealevel 463W Series

Wireless 802.11b/g Modbus TCP to 96 Channel TTL Digital I/O Adapter

From £329.00 (exc. VAT)

1 option available

Sealevel 463U Series

USB Modbus RTU to 96 Channel TTLDigital I/O Adapter

1 option available

Sealevel 463U-OEM Series

USB Modbus RTU to 96 Channel TTLDigital I/O OEM Board

1 option available

Sealevel 463S Series

RS-232 Modbus RTU to 96 Channel TTL Digital I/O Adapter

From £283.00 (exc. VAT)

Showing 180 of 426

What Is Sealevel’s Specialty?
Sealevel focus on serial and I/O expansion solutions, including USB-to-serial adaptors, digital I/O modules and embedded control systems. Their designs are trusted where reliable connectivity is required across industrial and military sectors.

Why Choose Sealevel Hardware?
With extensive experience in serial communications, Sealevel products provide the robust connectivity needed to extend the life of legacy equipment. Many models also meet MIL-STD specifications for defence projects.

Why Source in the UK Through Impulse?
We deliver Sealevel hardware to our UK customers with technical guidance and lifecycle support, ensuring integration is seamless and supply is dependable across long-term projects.