STARTECH PEXUSB3S25 2 Port PCI Express USB 3.0 Expansion Card
- 2x USB Ports
- USB 3.0
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Adds one 16550 UART 9-pin RS232 serial port at 230 Kbps via a PCI card compatible with 32-/64-bit, 3.3V/5V and PCI-X slots
This SIIG CyberSerial card adds one 9-pin RS232 port to a desktop PC through a standard PCI slot. It is built for technicians and industrial users who must connect serial peripherals such as barcode scanners or POS displays to modern motherboards that lack native COM ports. The board fits 32-bit or 64-bit PCI and PCI-X slots at 3.3 V or 5 V.
The on-board 16550 UART tops out at 230 Kbps, so the port cannot serve high-speed serial links or multi-drop networks that demand faster throughput. Legacy operating systems from Windows 95 through Server 2003 are supported, but newer releases are not covered by the supplied WHQL driver.
The card can deliver 5 V or 12 V on the DB-9 connector when the jumper blocks are set accordingly, allowing bus-powered scanners and displays to run without an external adapter. If your device needs a different voltage or draws more current than the slot can supply, this card will not meet the requirement.
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| Product | |
|---|---|
| Brand name | SIIG |
| Model name | JJ-P01012 |
| Product type | PCI to Serial Port Card |
| Performance | |
| Transfer speed | 230 kbit/s |
| Ports & slots | |
| External connectors | One 9-pin RS232 serial port |
| Size & build | |
| Shipping weight | 0.54 kg |
| Package size | 178 × 127 × 51 mm |
| Compatibility | |
| Supported operating systems | Windows 95/98/98 SE/ME/NT4.0/2000/XP/Server 2003 |
| In the box | |
| In the box | JJ-P01012 CyberSerial PCI Card Driver CD Quick installation guide |
The card includes a single WHQL-certified driver CD that covers Windows 95 through Server 2003, so no separate version choice is needed.
It is the maximum asynchronous throughput the 16550 UART can sustain; real-world rates depend on cable length, device buffering and system interrupt latency.
Yes — the board supports 32-/64-bit, 3.3 V/5 V PCI and PCI-X slots, and jumpers select 5 V or 12 V output on pin 9 for powered peripherals.
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