Industrial Serial Cards and Adaptors for System Expansion

Expand your system’s connectivity with our wide range of industrial serial cards and adaptors. Available in single and multi-port configurations, these boards support popular bus interfaces including PCI, PCI Express, PC/104, and Mini PCIe, making them ideal for both legacy integration and modern embedded applications.

If you're adding RS-232, RS-422, or RS-485 ports to a workstation or embedded PC, our serial cards offer reliable, high-performance communication in demanding environments.

Not sure which interface you need? Our technical specialists are here to help.

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Showing 110 of 110 Serial Cards & Adaptors items

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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)

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 3588 Series

8 Port RS-485 PC/104 Serial Card

Sealevel 3541-KT

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

1 option available

Sealevel 3540 Series

4 Port RS-232/422/485 PC/104 Serial Card

1 option available

Sealevel 3514 Series

1 Port RS-232/422/485/530/530A/V.35 PC/104+ Synchronous Serial Card

1 option available

Sealevel 3512 Series

1 Port RS-232/422/485/530/530A/V.35 PC/104 Synchronous Serial Card

1 option available

Sealevel 7804e Series

8 Port RS-232/422/485 PCI Express Asynchronous Serial Card

1 option available

Sealevel 7804 Series

8 Port RS-232/422/485 PCI Serial Card

4 options available

Sealevel 7803 Series

8 Port RS-232 Low Profile PCI Serial Card

2 options available

Sealevel 7802ec Series

8 Port RS-422/485 Low Profile PCI Express Asynchronous Serial Card

From £415.50 (exc. VAT)

4 options available

Sealevel 7406e Series

4 Port RS-232 Low Profile PCI Express Asynchronous Serial Card

1 option available

Sealevel 7404e Series

4 Port RS-232/422/485 PCI Express Asynchronous Serial Card

2 options available

Sealevel 7205ec Series

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

From £253.00 (exc. VAT)

2 options available

Sealevel 7205 Series

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

From £674.50 (exc. VAT)

2 options available

Sealevel 7204e Series

2 Port RS-422/485 Low Profile PCI Express Asynchronous Serial Card

4 options available

Sealevel 7204 Series

2 Port RS-422/485 PCI Serial Card

1 option available

Sealevel 7203e Series

2 Port RS-232/422/485 Isolated PCI Express Asynchronous Serial Card

From £205.00 (exc. VAT)

1 option available

Sealevel 7402e Series

4 Port RS-422/485 Low Profile PCI Express Asynchronous Serial Card

2 options available

Sealevel 7202 Series

2 Port RS-232 PCI Serial Card

2 options available

Sealevel 7201 Series

2 Port RS-232/422/485 PCI Serial Card

2 options available

Sealevel 7161e Series

16 Port RS-232 PCI Express Asynchronous Serial Card

3 options available

Sealevel 7161 Series

16 Port RS-232 PCI Serial Card

2 options available

Sealevel 7108 Series

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

From £636.00 (exc. VAT)

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

Moxa OPT 8B+ Series

VHDCI 68 to 8x DB25(M) Connection Box

Moxa OPT8-RJ45

DB62(M) to 8 X RJ45 (8-Pin) Connection Box

Moxa OPT8-M9

DB62(M) to 8x DB9(M) Connection Box

Moxa OPT8-M9+

VHDCI 68 to 8x DB9(M) Connection Box

Moxa NP21103

DB25 Terminal Block Kit for RS-422/485

Moxa OPT 8S

DB62(M) to 8x DB25(F) Connection Box: Surge Protection

Moxa OPT 8B

DB62(M) to 8x DB25(M) Connection Box

Moxa OPT 8A

DB62(M) to 8x DB25(F) Connection Box

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

5 options available

Sealevel 7406 Series

4 Port RS-232 Low Profile PCI Serial Card

From £481.50 (exc. VAT)

1 option available

Advantech MIC-3955 Series

4 Port RS-232/422/485 3U Compactpci Serial Card

From £413.50 (exc. VAT)

Advantech UIO-4030

UIO40-Express I/O Expansion Card – 1x RS-485 – 1x RS-232 – 4x DI & 4x DO

£45.00 (exc. VAT)

Learn More About Serial Cards & Adaptors

Why Use Serial Cards in Modern Systems?

Many modern PCs, servers and embedded platforms no longer include native serial ports. Serial expansion cards restore RS-232, RS-422 or RS-485 connectivity, allowing engineers to continue interfacing with existing industrial equipment and control systems without redesigning their setup.

How Do Adaptors Add Flexibility?

Serial adaptors provide a simple way to convert between different serial standards or between USB and serial interfaces. This flexibility makes it easier to connect a wide range of legacy devices, support temporary installations or accommodate changes in system requirements without replacing hardware.

Do Serial Cards and Adaptors Support Multiple Operating Systems?

Many industrial serial cards and adaptors are supplied with driver support for common operating systems, including Windows, Linux and a range of embedded platforms. This ensures they can be deployed across different environments, from control room PCs to embedded industrial computers. Checking operating system compatibility early helps avoid integration issues and ensures long-term support as systems are updated or expanded.

What Is the Difference Between PCIe and USB Serial Solutions?

PCIe serial cards are installed directly into a PC or industrial computer, providing fixed, high-reliability serial ports that are well suited to permanent installations and continuous operation. USB serial adaptors connect externally, offering greater flexibility and portability, making them useful for temporary setups, service work or systems where internal expansion slots are not available. The choice depends on whether stability or flexibility is the primary requirement.

What Benefits Do Industrial Models Offer?

Industrial serial cards and adaptors are designed for reliable operation in demanding environments. Features such as enhanced electrical isolation, extended operating temperature ranges and robust component selection help ensure long service life in applications such as factory automation, transport and utilities.

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Industrial Serial Cards and Adaptors for System Expansion

Learn More About Serial Cards & Adaptors

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