The PCM-G-COM8 is an 8-channel PC/104-compatible serial module. It is well suited for embedded applications requiring a large number of serial I/O ports. Each channel supports RS-232, RS-485, and RS-422 electrical levels to interface to a wide variety of serial communications devices such as modems, data collection equipment, and distributed I/O terminals. The PCM-COM8 will operate over the full industrial temperature range of -40° to +85° Celsius.


  • Eight independent COM channels
  • Two 16C554-compatible quad UARTs
  • 128-byte TX and RX receive FIFOs on each channel
  • RS-232, RS-485, and RS-422 electrical interface levels on all channels
  • All outputs short circuit protected
  • Modem control signals: CTS, RTS, DSR, DTR, RI, and DCD on each channel
  • Programmable serial interface characteristics for each channel:
    • 5-, 6-, 7-, or 8-bit character lengths
    • Even, odd, or no parity generation and checking
    • 1,1.5, or 2 stop bits
    • Local internal loopback for diagnostics
  • Industrial -40° to +85°C operational temperature
Serial I/O

Two 4-channel UARTs (16C554)
128-byte transmit and receive FIFO buffer
RS-232/422/485 port types available for channels
Standard modem interface support
Up to 1.5 Mbps data transmit rate

Bus Interface



+5V required, 125 mA (RS-232 mode), 350 mA (RS-422 mode) typical


Dimensions: 3.6 x 3.8 inches (90 x 96 mm)

Operating Temperature Range

-40°C to 85°C