Features
This product has been discontinued. Please contact us for help in finding a suitable replacement.
Great News! ACCES has designed the replacement for this discontinued product. Just a click away to the LPCI-COM485/8!
Universal PCI, PCI-X, 3.3V and 5V compatible (Call for PCI-Express availability)
Eight-port serial communications card for PCI bus
Supports RS-485 and RS-422 protocols respectively
Include type 16550 UARTs with 16-byte FIFO buffers
Baud rates up to 460,800 baud
No base address or IRQ switches to set
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 ¾ length and may be installed in any 5-volt PCI 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 PCI-COM485/8S1 and PCI-COM422/8S1.
Type 16550 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 percent 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 75176, 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.
When the card is first installed, Windows will detect it as new hardware and assign it an IRQ number and base address. There are no switches to set or base addresses to assign, making it easy to use. From this point on, the card behaves as standard COM ports at COM 5,6,7,8,9,10,11, and 12. 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 address space so your card's address may be located anywhere in the 0000 to FFFF range.
RTS AND AUTO TRANSCEIVER CONTROL
In RS-485 multidrop communications individual drivers must be enabled when needed and then disabled after use to permit all ports on the network to share a two-wire or four -wire cable. The PCI-COM485/8 has two methods to control the drivers: automatic (AUTO) and request-to-send (RTS) control. Under automatic control, the driver is enabled (and the receiver disabled) when data are ready to be transmitted. When transmission is complete, the driver remains enabled for the transmission time of one additional character and then is disabled. The card automatically adjusts this timing to the data baud rate. (NOTE: for use in half-duplex mode under Windows systems, PCI-COM485/8 must be operated in the AUTO mode.) In the RTS mode, application software must set a bit in a control register to enable the driver and reset that bit to disable the driver.
Features
- This product has been discontinued. Please contact us for help in finding a suitable replacement.
- Great News! ACCES has designed the replacement for this discontinued product. Just a click away to the LPCI-COM485/8!
- Universal PCI, PCI-X, 3.3V and 5V compatible (Call for PCI-Express availability)
- Eight-port serial communications card for PCI bus
- Supports RS-485 and RS-422 protocols respectively
- Include type 16550 UARTs with 16-byte FIFO buffers
- Baud rates up to 460,800 baud
- No base address or IRQ switches to set
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 ¾ length and may be installed in any 5-volt PCI 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 PCI-COM485/8S1 and PCI-COM422/8S1.
Type 16550 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 percent 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 75176, 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.
When the card is first installed, Windows will detect it as new hardware and assign it an IRQ number and base address. There are no switches to set or base addresses to assign, making it easy to use. From this point on, the card behaves as standard COM ports at COM 5,6,7,8,9,10,11, and 12. 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 address space so your card's address may be located anywhere in the 0000 to FFFF range.
RTS AND AUTO TRANSCEIVER CONTROL
In RS-485 multidrop communications individual drivers must be enabled when needed and then disabled after use to permit all ports on the network to share a two-wire or four -wire cable. The PCI-COM485/8 has two methods to control the drivers: automatic (AUTO) and request-to-send (RTS) control. Under automatic control, the driver is enabled (and the receiver disabled) when data are ready to be transmitted. When transmission is complete, the driver remains enabled for the transmission time of one additional character and then is disabled. The card automatically adjusts this timing to the data baud rate. (NOTE: for use in half-duplex mode under Windows systems, PCI-COM485/8 must be operated in the AUTO mode.) In the RTS mode, application software must set a bit in a control register to enable the driver and reset that bit to disable the driver.
