M.2 4-port Isolated RS-232 serial

  • Description
  • Specifications
  • Ordering Guide
  • Optional Accessories

The M.2-ICM232 family of cards feature high performance 16C950-class UARTs. Available in 4-port (M.2-ICM232-4) and 2-port (M.2-ICM232-2) versions, each port is capable of communication speeds up to 921.6kbps and has 128-byte deep transmit and receive FIFOs which protect against data loss in multitasking operating systems, reduce CPU utilization, and improve data throughput. 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.

The RS232 ports provided by the card are 100% compatible with every other industry-standard serial COM device, supporting TX, RX, RTS, and CTS. In addition, they provide Tru-Iso™ port-to-port and port-to-PC isolation.

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, 5-pin Hirose connector. Optional breakout cables are available, and bring each port connection to a panel-mountable DB9-M with an industry compatible RS232 pin-out.

Interface M.2 2260/2280 with B & M key
Number of serial ports 4 or 2 port
Protocols RS-232
Maximum baud rate Up to 921.6k baud
Advanced-prescaler allows a wide variety of unusual baud rates to be achieved
UARTs Quad 16C950
FIFO 128-byte FIFO for each transmit & receive buffer
Isolation Port-to-PC: 1500V peak (AC or DC)
Port-to-port: 500V peak (AC or DC)
Power required +3.3VDC @ 1.8W (typical)
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
M.2-ICM232-4 M.2 4-port Isolated RS-232 serial
M.2-ICM232-2 M.2 2-port Isolated RS-232 serial


Model Description
CAB-M.2-ICM4 Four port cable kit for M.2-ICM232-4
CAB-M.2-ICM2 Two port cable kit for M.2-ICM232-2
M.2-HDW-KIT2 2mm mounting hardware kit
M.2-HDW-KIT2.5 2.5mm mounting hardware kit