[SUNIX] Low-cost & flexible, RS-232 to RS-422/485 industrial converter module.



1 motherboard for 3 interface options!
The STD1109S / STD1105S are compact internal modules that convert onboard RS-232 signals to RS-422 or RS-485. They can be installed directly inside the chassis to enable stable long-distance and multi-drop serial communication, while keeping the original RS-232 port available and reducing the number of motherboard SKUs required.
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Single design, flexible fulfillmentReduce SKU complexity and lower inventory cost |
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Higher cost-efficiency than expansion cardsSimple module upgrade, no expensive add-on card neededs |
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No PCIe / M.2 slot requiredDirectly connects to the motherboard’s RS-232 header |
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Industrial-grade electrical protectionESD ±15 kV Air / ±8 kV Contact, 2 kV Surge protection |

Product Family


Since our founding in 1986, and after releasing the world’s first single-chip serial card in 1995, SUNIX has stood as the global leader in the commercial communication control industry. With a R&D center in Taiwan, we’re actively expanding into areas such as AI, IoT, and automotive communication (electric vehicles). Fantastic products, strict quality control, and uncompromising dedication to a healthy planet is how SUNIX empowers you.
[SUNIX] Low-cost & flexible, RS-232 to RS-422/485 industrial converter module.



1 motherboard for 3 interface options!
The STD1109S / STD1105S are compact internal modules that convert onboard RS-232 signals to RS-422 or RS-485. They can be installed directly inside the chassis to enable stable long-distance and multi-drop serial communication, while keeping the original RS-232 port available and reducing the number of motherboard SKUs required.
![]() |
Single design, flexible fulfillmentReduce SKU complexity and lower inventory cost |
![]() |
Higher cost-efficiency than expansion cardsSimple module upgrade, no expensive add-on card neededs |
![]() |
No PCIe / M.2 slot requiredDirectly connects to the motherboard’s RS-232 header |
![]() |
Industrial-grade electrical protectionESD ±15 kV Air / ±8 kV Contact, 2 kV Surge protection |

Product Family


Since our founding in 1986, and after releasing the world’s first single-chip serial card in 1995, SUNIX has stood as the global leader in the commercial communication control industry. With a R&D center in Taiwan, we’re actively expanding into areas such as AI, IoT, and automotive communication (electric vehicles). Fantastic products, strict quality control, and uncompromising dedication to a healthy planet is how SUNIX empowers you.
[SUNIX] Low-cost & flexible, RS-232 to RS-422/485 industrial converter module.



1 motherboard for 3 interface options!
The STD1109S / STD1105S are compact internal modules that convert onboard RS-232 signals to RS-422 or RS-485. They can be installed directly inside the chassis to enable stable long-distance and multi-drop serial communication, while keeping the original RS-232 port available and reducing the number of motherboard SKUs required.
![]() |
Single design, flexible fulfillmentReduce SKU complexity and lower inventory cost |
![]() |
Higher cost-efficiency than expansion cardsSimple module upgrade, no expensive add-on card neededs |
![]() |
No PCIe / M.2 slot requiredDirectly connects to the motherboard’s RS-232 header |
![]() |
Industrial-grade electrical protectionESD ±15 kV Air / ±8 kV Contact, 2 kV Surge protection |

Product Family


Since our founding in 1986, and after releasing the world’s first single-chip serial card in 1995, SUNIX has stood as the global leader in the commercial communication control industry. With a R&D center in Taiwan, we’re actively expanding into areas such as AI, IoT, and automotive communication (electric vehicles). Fantastic products, strict quality control, and uncompromising dedication to a healthy planet is how SUNIX empowers you.
[SUNIX] Low-cost & flexible, RS-232 to RS-422/485 industrial converter module.



1 motherboard for 3 interface options!
The STD1109S / STD1105S are compact internal modules that convert onboard RS-232 signals to RS-422 or RS-485. They can be installed directly inside the chassis to enable stable long-distance and multi-drop serial communication, while keeping the original RS-232 port available and reducing the number of motherboard SKUs required.
![]() |
Single design, flexible fulfillmentReduce SKU complexity and lower inventory cost |
![]() |
Higher cost-efficiency than expansion cardsSimple module upgrade, no expensive add-on card neededs |
![]() |
No PCIe / M.2 slot requiredDirectly connects to the motherboard’s RS-232 header |
![]() |
Industrial-grade electrical protectionESD ±15 kV Air / ±8 kV Contact, 2 kV Surge protection |

Product Family









