mPCIe 4-port RS-232/422/485 serial

  • Description
  • Specifications
  • Ordering Guide
  • Optional Accessories

The mPCIe-COM-4SM family of cards feature high performance 16C950-class UARTs. Available in 4-port and 2-port versions, each port is capable of communication speeds up to 921.6kbps in RS-232 (differential modes support speeds as high as 3Mbps) and has 128-byte deep transmit and receive FIFOs. Large FIFOs protect against data loss in multitasking operating systems, reduce CPU utilization, and improve data throughput, while reducing or eliminating inter-character or inter-packet pauses. The advanced integrated circuit with pre-scalar supports a wide variety of custom baud rates, and any rates not otherwise achievable can be supported via a custom factory-installed crystal oscillator (up to 10Mbps!).

RS-232, RS-422, or RS-485 can be software selected, per port, and the selection is stored in non-volatile memory for future use. If you don’t need that much flexibility you can order versions with only RS422/485 or even pure RS232. The RS232 ports provided by the card are 100% compatible with every other industry-standard serial COM device, supporting TX, RX, RTS, and CTS. RS422 mode uses the same transceivers as the RS-485 specification, allowing perfect 4-wire RS-422 and RS-485 compatibility – and the device supports full-duplex RS-485 4-wire.

Communication is possible either with custom application software, with off-the-shelf applications (such as HyperTerminal), or with provided samples and utilities, including WinRISC™ (“Windows Really Incredibly Simple Communication”).

The serial ports on the device are accessed using a low-profile, latching, 6-pin Hirose connector. Optional breakout cables are available, and bring each port connection to a panel-mountable DB9-M connector.

Number of serial ports 4 or 2 ports
Protocols “SM” model – RS-232/422/485
“S” model: RS-422/485
“COM232” model: RS-232 only
Maximum baud rate Up to 921.6k baud in RS-232
Up to 3MBaud in differential modes

dvanced-prescaler allows a wide variety of unusual baud rates to be achieved
Up to 10Mbps via custom crystal option

UARTs Quad 16C950
FIFO 128-byte FIFO for each transmit & receive buffer
Power required +3.3VDC @ 1.6W (typical)
Form Factor PCIe MiniCard full size
Dimensions 50.95 x 30mm
Operating temperature -40ºC to +85ºC
Operating humidity 5% to 95% noncondensing
ESD Protection ±15kV on all signal pins (IEC 61000)
Weight 6.4g


Model Description
mPCIe-COM-4SM mPCIe 4-port RS-232/422/485 serial
mPCIe-COM-2SM mPCIe 2-port RS-232/422/485 serial
mPCIe-COM-4S mPCIe 4-port RS-422/485 serial
mPCIe-COM-2S mPCIe 2-port RS-422/485 serial
mPCIe-COM232-4 mPCIe 4-port RS-232 serial
mPCIe-COM232-2 mPCIe 2-port RS-232 serial
Model Description
CAB-mPCIe-COM4 Four port DB9 male cable accessory kit
CAB-mPCIe-COM4-IP67 Four port DB9 IP67 male cable accessory kit
CAB-mPCIe-COM2 Two port DB9 male cable accessory kit
CAB-mPCIe-COM2-IP67 Two port DB9 IP67 male cable accessory kit
ADAP9 Screw terminal adapter (single DB9 female to 9 screw terminals)
mPCIe-HDW-KIT2 2mm mounting hardware kit
mPCIe-HDW-KIT2.5 2.5mm mounting hardware kit