产品描述The OMG-ULTRACOMM2-PCI provides two field selectable RS232/422/485 serial ports for control and automation applications. Configure both ports as RS232 for standard serial COM: port requirements. Choose RS422 for long distance device connections at up to 1219 m (4000') where noise immunity and high data integrity are essential. Multi-drop up to 31 RS485 devices to each port in a RS485 bus for automated data collection. Mix the interfaces in any of the interface combinations to provide maximum flexibility to your communications.