104-COM-8SM and 104-COM-4SM PC/104 Eight- and Four-Port Serial Communication Boards FEATURES Specifications 8 or 4 independent asynchronous serial COM ports Field selectable RS-232, RS-422 and RS-485, independent for each port Auto-RTS feature makes half-duplex RS-485 communications effortless Speeds up to 921.6K with 64-byte FIFO Fixed bias and jumper selectable termination provided on each transmit and receive channel simplifies cabling Programmable individual non-volatile base addresses and IRQs simplifies installation Low power required: +5VDC at 80 mA typical Operates as a standard COM port in all operating systems Factory Options: (call for pricing and availability) 0 to 70 C and -40 to +85 C versions available 4 port version available