Desktop PCs and Servers have internal slots allowing for serial cards to be connected. These slots are either newer PCI Express slots or the older PCI slot or maybe a mixture of both. Even though the slots have similar sounding names, they are not interchangeable - PCI cards cannot fit into PCI Express slots and PCI Express cards cannot fit into PCI slots.

Brainboxes manufacture an extensive range of PCI and PCI Express cards with 1 to 8 ports, RS232 or RS422/485, low profile or standard height, and with or without cables.

UC-157 - Low Profile Parallel Port Printer PCI Card

UC-157

Low Profile Parallel Port Printer PCI Card
1 Port DB9 LPT Printer Port PCI Low Profile
PX-157 - Parallel Port Printer Low Profile PCI Express Card

PX-157

Parallel Port Printer Low Profile PCI Express Card
1 Port DB9 LPT Printer Port PCI Express Low Profile
PX-235 - 1 Port RS232 Low Profile PCI Express Serial Card

PX-235

1 Port RS232 Low Profile PCI Express Serial Card
1 Port DB9 RS232 PCI Express Low Profile
UC-235 - 1 Port RS232 Low Profile PCI Serial Card

UC-235

1 Port RS232 Low Profile PCI Serial Card
1 Port DB9 RS232 PCI Low Profile
PX-803 - Low Profile PCI Express 1 Port RS232 Powered (through SATA power connector) 1 Amp POS Card

PX-803

Low Profile PCI Express 1 Port RS232 Powered (through SATA power connector) 1 Amp POS Card
1 Port DB9 RS232 PCI Express Powered Low Profile
PX-812 - Low Profile PCI Express 1 Port RS232 Powered (through IDE power connector) 1 Amp POS Card

PX-812

Low Profile PCI Express 1 Port RS232 Powered (through IDE power connector) 1 Amp POS Card
1 Port DB9 RS232 PCI Express Powered
UC-320 - 1 Port RS422/485 Low Profile PCI Serial Card

UC-320

1 Port RS422/485 Low Profile PCI Serial Card
1 Port DB9 RS422/485 PCI Low Profile
PX-320 - 1 Port RS422/485 Low Profile PCI Express Port Card

PX-320

1 Port RS422/485 Low Profile PCI Express Port Card
1 Port DB9 RS422/485 PCI Express Low Profile
PX-376 - 1 Port RS422/485 Low Profile PCI Express Serial Card Opto Isolated

PX-376

1 Port RS422/485 Low Profile PCI Express Serial Card Opto Isolated
1 Port DB9 RS422/485 PCI Express Galvanic Isolation
PX-801 - Low Profile PCI Express 2 Port RS232 Powered (through SATA power connector) 1 Amp POS Card

PX-801

Low Profile PCI Express 2 Port RS232 Powered (through SATA power connector) 1 Amp POS Card
2 Port DB9 RS232 PCI Express Powered Low Profile
PX-809 - Low Profile PCI Express 2 Port RS232 Powered (through IDE power connector) 1 Amp POS Card

PX-809

Low Profile PCI Express 2 Port RS232 Powered (through IDE power connector) 1 Amp POS Card
2 Port DB9 RS232 PCI Express Powered Low Profile
PX-101 - 2 Port RS232 Low Profile PCI Express Serial Card

PX-101

2 Port RS232 Low Profile PCI Express Serial Card
2 Port DB9 RS232 PCI Express Low Profile
UC-101 - 2 Port RS232 Low Profile PCI Serial Port Card

UC-101

2 Port RS232 Low Profile PCI Serial Port Card
2 Port DB9 RS232 PCI Low Profile
UC-203 - 2 Port RS232 Low Profile PCI Serial Port Card with LPT Parallel Port

UC-203

2 Port RS232 Low Profile PCI Serial Port Card with LPT Parallel Port
3 Port DB9 RS232 PCI LPT Printer Port
UC-253 - 2 Port RS232 Low Profile PCI Serial Port Card

UC-253

2 Port RS232 Low Profile PCI Serial Port Card
2 Port DB9 RS232 PCI Low Profile
UC-049 - 4 Port Low Profile RS232 PCI Serial Card Opto Isolated TX RX GND

UC-049

4 Port Low Profile RS232 PCI Serial Card Opto Isolated TX RX GND
4 Port DB9 RS232 PCI Galvanic Isolation
UC-061 - 4 Port Low Profile RS232 PCI Serial Card Opto Isolated TX,RX,GND,CTS & RTS

UC-061

4 Port Low Profile RS232 PCI Serial Card Opto Isolated TX,RX,GND,CTS & RTS
4 Port DB9 RS232 PCI Galvanic Isolation
UC-260 - 4 Port RS232 Low Profile PCI Serial Port Card DB9

UC-260

4 Port RS232 Low Profile PCI Serial Port Card DB9
4 Port DB9 RS232 PCI Low Profile
PX-260 - 4 Port RS232 Low Profile PCI Express Serial Card

PX-260

4 Port RS232 Low Profile PCI Express Serial Card
4 Port DB9 RS232 PCI Express Low Profile
UC-263 - 4xRS232 Low Profile PCI Serial Port Card with LPT Parallel Port for Printer

UC-263

4xRS232 Low Profile PCI Serial Port Card with LPT Parallel Port for Printer
4 Port DB9 RS232 PCI LPT Printer Port
UC-271 - 4 Port RS232 Low Profile PCI Serial Port Card DB25

UC-271

4 Port RS232 Low Profile PCI Serial Port Card DB25
4 Port DB25 RS232 PCI Low Profile
PX-335 - 4 Port RS422/485 Low Profile PCI Express Serial Port Card

PX-335

4 Port RS422/485 Low Profile PCI Express Serial Port Card
4 Port DB9 RS422/485 PCI Express Low Profile

PCI and PCI Express Comparison

 

PCI

Universal PCI

PCI Express

Brainboxes Range PCI slot has 1 key way and compatible with only 5V PCI slot
Universal PCI card, both key ways, therefore compatible with both 3.3V and 5V PCI slot
PCIe card compatible with all PCI Express slots
CC UC PX
Slot Compatibility Only 1 Key Way: Can only be inserted in 5V PCI slots 2 Key Ways: Can be inserted in either 3.3V or 5V PCI slots Can be inserted into ANY PCIe slot (x1,x2,x4,x8,x16)
Height PCI Express boards are the same height and length as PCI cards
Bracket PCI Express uses the same card brackets as PCI boards, either standard or Low Profile

Low Profile and Standard Height

Standard height PCI brackets fit into standard size PC's. Low Profile BRackets allow the serial card to fit into Low Profile PC's

Both PCI and PCIe cards can come in different heights. The height effects which kind of computer the card can fit into. Low Profile (or half height or low height) fit into slim PC's and servers. A general rule of thumb is that if the height of your PC (including case) is less than 4 inches ( 100mm) then it requires a low profile card. 

PCI Spec

PCIe slots

Conventional PCI (part of the PCI Local Bus standard and often shortened to PCI) is a computer bus for attaching hardware devices in a computer. These devices can take either the form of an integrated circuit fitted onto the motherboard itself, called a planar device in the PCI specification, or an expansion card that fits into a slot. The name PCI is an initialism formed from Peripheral Component Interconnect. The PCI Local Bus is common in modern PCs, where it has displaced ISA and VESA Local Bus  as the standard expansion bus, and it also appears in many other computer types. Despite the availability of faster interfaces such as PCI-X and PCI Express, conventional PCI remains a very common interface.

PCIe Spec

PCIe slots

PCI Express (Peripheral Component Interconnect Express), officially abbreviated as PCIe (or PCI-E, as it is commonly called), is a computer expansion card standard designed to replace the older PCI, PCI-X, and AGP standards. PCIe 2.1 is the latest standard for expansion cards that is available on mainstream personal computers.

PCI Express is used in consumer, server, and industrial applications, as a motherboard-level interconnect (to link motherboard-mounted peripherals) and as an expansion card interface for add-in boards. A key difference between PCIe and earlier buses is a topology based on point-to-point serial links, rather than a shared parallel bus architecture.