WINSYSTEMS Industrial Partner

MCM-COM4A-4 - Win Systems MCM-COM4A-4 I/O Card. STD Bus four channel, RS-232/485...

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Win Systems MCM-COM4A-4 I/O Card. STD Bus four channel, RS-232/485 Serial card Simple Type: I/O Module

The MCM-COM4A is a 4 channel serial 8250 compatible STD Bus board based on the Startech 16C554. It is ideally suited for applications that require exact PC compatible hard ware to the register level. Each channel is individually configurable for RS-232, RS-422, or RS-485 modes. Versatile interrupt routing allows for front plane or back plane interrupts as well as shared interrupts. An interrupt status register allows easy identification of the interrupt source. Three I/O mapping options allow for a total of up to 10 COM ports in a PC style system. The Startech 16C554 has a soft ware programmable transmit and receive FIFO of up to 16 bytes in depth.

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  • +5 volt only operation
  • 1, 1.5, or 2 stop bits
  • 5, 6, 7, or 8-bit characters
  • Asynchronous data rates to 115Kbps
  • Even, odd, or no parity
  • Four independent 8250 compatible serial channels
  • Frontplane or backplane interrupts supported
  • Independent control of transmit, receive, line status, and data set interrupts on each channel
  • Local loopback for diagnostics
  • Onboard watchdog timer
  • Programmable serial interface characteristics for each channel
  • RS-232, RS-485, and RS-422 electrical levels on all channels
  • Software programmable board I/O address selectable for PC-XT/AT hardware/software compatibility
  • STD Bus compatible


  • Bus Interface: STD Bus compatible
  • Dimensions: 4.5" x 6.5"
  • Interrupt: 10-pin 0.100" grid
  • Jumpers: 0.025" square posts
  • Non-condensing relative humidity: 5% to 95%
  • Operating Temperature: 0°C to +65°C
  • Power: +5V required, 425 mA (typ.)
  • Serial: Four 10-pin 0.100" grid



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