ACCES I/O M.2-COM-2S 2-Port Serial M.2 Card Supports RS-422 and RS-485

ACCES I/O M.2-COM-2S 2-Port Serial M.2 Card Supports RS-422 and RS-485


  • M.2 2260/2280 size with B & M keys and Latching I/O Connectors
  • Serial Types: RS-422, And RS-485
  • High Performance 16C950-Class UARTs With 128-Byte FIFO For Tx And Rx Buffering
  • Supports Data Communication Rates To 921.6Kbps In RS232 – As High As 3Mbps In Differential Modes – 10Mhz With Custom Crystal Option
  • Port-By-Port Field Selectable Termination For RS422 & RS485 Applications
  • Virtually Any Custom Baud Rate May Be Configured By The User Via Register Settings, No Custom Oscillator Needed
  • ±15kV ESD Protection On All Signal Pins
  • Supports CTS, RTS, And 9-Bit Data Mode, Half- and Full-Duplex communications
  • RoHS And Industrial Temp (-40°C To 85°C) Both Standard
  • Support for Wind River VxWorks (call for ordering information)
  • Designed, made, supported, and manufactured in the USA


The ACCES I/O M.2-COM-2S features high performance 16C950-class UARTs. This card has 2-Ports 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. 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. 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.

Ordering Info

M.2-COM-4SM 4-Port, RS232, RS-422 and RS-485 M.2 Card
M.2-COM-2SM 2-Port, RS232, RS-422 and RS-485 M.2 Card
M.2-COM-4S 4-Port, RS-422 and RS-485 M.2 Card
M.2-COM-2S 2-Port, RS-422 and RS-485 M.2 Card
M.2-COM232-4 4-Port, RS232 M.2 Card
M.2-COM232-2 2-Port, RS232 M.2 Card


System Integration

Please ask about how we can configure your solution

Global Operations

We ship and support products via offices globally

Full Warranty

Industry leading warranties on all solutions as standard

Technical Support

Experienced engineers are on hand to support your project

Can't Find What You Want?


M.2 Card 2260/2280 size
I/O Hirose DF57-6P-1.2V 6-pin, latching
Mating Hirose DF57H-6S-1.2C
Serial Ports 2
Serial Type RS-422, RS-485
UART Quad 16C950
FIFO 128-byte transmit & receive
Buad Rates up to 921.6k baud in RS-232 up to 3MBaud in differential modes advanced-prescaler allows a wide variety of unusual baud rates to be achieved. Up to 10Mbps via custom crystal option
Character Length 5, 6, 7, 8 bits (contact factory for assistance with 9-bit data)
Parity Even, Odd, None, Mark, Space
Stop Interval 1, 1½, 2 bits
Flow Control RS-422, RS-485: Xon / Xoff, None
Temperature Operating: -40° to 85°C Storage: -65° to 150°C
Humidity 5% to 95%, non-condensing
Power Required +3.3VDC @ 1.6W (typical)
ESD Protection ±15kV on all signal pins (IEC 61000)
Weight 6.0 grams
Size Length: 60mm/80mmWidth: 22mm