LPCI-COM485-8 eight-port, asynchronous, serial communication cards designed for use on the PCI bus
These are eight-port, asynchronous, serial communication cards designed for use on the PCI bus. They support RS-485 and RS-422 communications. The cards are 6.6 inches in length and 2.21 inches seated height and may be installed in any 3.3 or 5-volt PCI or PCI-X slot in IBM and compatible personal computers. Normally, these units are supplied with an eight-connector breakout cable. However, they are available without that cable as models LPCI-COM485/8S1 and LPCI-COM422/8S1.
Type 16C550 UARTS are used as the asynchronous communication elements. These include a 16-byte transmit/receive FIFO buffer to protect against lost data in multitasking systems while maintaining 100% compatibility with the original IBM serial port.
Crystal oscillators located on the cards permit precise baud rate capability up to 115,200. Higher baud rates, up to 460,800 baud, are achieved by changing a jumper on the card. The driver/receivers used, type SN75176B, are capable of driving long communication lines at high baud rates. They can drive up to ±60 mA on balanced lines and receive inputs as low as 200 mV differential signal superimposed on common mode noise of +12 to -7V. In case of communication conflict, the driver/receivers feature thermal shutdown.
Since these are PCI-Bus cards, the Operating System determines the resources assigned to the card. As a result, you cannot set or change the card's base address. You can only determine what the system has assigned. The PCI Bus supports 64K of I/O bus address space so your card's address may be located anywhere in the 0000 to FFFF range.
|
