
THOMAS-CONRAD CORPORATION

TC6245-OTP(ORDINARY TWISTED PAIR)

NIC Type      ARCnet
Transfer Rate 2.5Mbps
Data Bus      16-bit ISA
Topology      Star

              Linear Bus
Wiring Type   Shielded twisted pair

              Unshielded twisted pair
Boot ROM      Available

[Image]

                               NODE ADDRESS

  Node   SW2/1    SW2/2   SW2/3   SW2/4    SW2/5   SW2/6    SW2/7   SW2/8

   0       -       -        -       -       -        -       -        -

   1      Off      On      On      On       On      On       On      On

   2      On      Off      On      On       On      On       On      On

   3      Off     Off      On      On       On      On       On      On

   4      On       On      Off     On       On      On       On      On

  251     Off     Off      On      Off     Off      Off     Off      Off

  252     On       On      Off     Off     Off      Off     Off      Off

  253     Off      On      Off     Off     Off      Off     Off      Off

  254     On      Off      Off     Off     Off      Off     Off      Off

  255     Off     Off      Off     Off     Off      Off     Off      Off

  Note:Node address 0 is used for messaging between nodes and must not be
  used.

       A total of 255 node address settings are available. The switches
       are a binary representation of the decimal node addresses. Switch
       1 is the Least Significant Bit and switch 8 is the Most
       Significant Bit. The switches have the following decimal values:
       switch 1=1, 2=2, 3=4, 4=8, 5=16, 6=32, 7=64, 8=128. Turn off the
       switches and add the values of the off switches to obtain the
       correct node address. (On=0, off=1)

                   RESPONSE AND RECONFIGURATION TIMEOUT

  Network Cable    JP12      JP13     ResponseTime (     Reconfiguration
     Length                                 m              Time (mS)

     Less than    Open      Open          74.7               840
        20,000
        feet

      more than   Closed     Open         283.4               1680
        20,000
        feet

      more than    Open     Closed        561.8               1680
        20,000
        feet

      more than   Closed    Closed        1118.6              1680
        20,000
        feet

      Note : All NICs on the network must have these two jumpers set the
      same.

                            BASE MEMORY ADDRESS

     Memory       SW1/1    SW1/2     SW1/3     SW1/4     SW1/5     SW1/6
    Address

      D000h       Off      Off        On       Off       On        On

       C000h       Off      Off        On       On        On        On

       C400h       Off      Off        On       On        On        Off

       C800h       Off      Off        On       On        Off       On

       CC00h       Off      Off        On       On        Off       Off

       D400h       Off      Off        On       Off       On        Off

       D800h       Off      Off        On       Off       Off       On

       DC00h       Off      Off        On       Off       Off       Off

                                            INTERRUPT REQUEST

   IRQ     JP1      JP2      JP3      JP4      JP5     JP20     JP21     JP22     JP23     JP24     JP25

     9    Open     Open     Open     Open    Open     Open     Open     Open     Open     Open    Closed

      3    Open     Open     Open     Open    Open     Closed   Open     Open     Open     Open     Open

      4    Open     Open     Open     Open    Open     Open     Closed   Open     Open     Open     Open

      5    Open     Open     Open     Open    Open     Open     Open     Closed   Open     Open     Open

      6    Open     Open     Open     Open    Open     Open     Open     Open    Closed    Open     Open

      7    Open     Open     Open     Open    Open     Open     Open     Open     Open    Closed    Open

      10   Open     Open     Open     Open    Closed   Open     Open     Open     Open     Open     Open

      11   Open     Open     Open    Closed   Open     Open     Open     Open     Open     Open     Open

      13   Open     Open    Closed    Open    Open     Open     Open     Open     Open     Open     Open

      14  Closed    Open     Open     Open    Open     Open     Open     Open     Open     Open     Open

      15   Open    Closed    Open     Open    Open     Open     Open     Open     Open     Open     Open

                                WAIT STATE

                 Setting                               SW1/7

         Zero wait states disabled                      On

           Zero wait states enabled                     Off

                            COMPATABILITY MODE

                   Mode                                 SW1/8

                Enhanced mode                           On

                Compatible mode                          Off

  Note: Enhanced mode optimizes performance and minimizes conflicts of
  your hardware, by using a Thomas-Conrad

                               BLOCK DECODE

                  Size                                 JP7

          16K memory block decode              Pins 1 & 2 Closed

          128K memory block decode              Pins 2 & 3 Closed

       Note:A 16-bit VGA adapter typically decodes base memory in 128K
       blocks. If you are installing the NIC in a system with such a
       card, you may need to set the NIC block decode size to 128K. If
       you set the block decode size to 128K then all other adapters in
       the system must also utilize 128K decode.

                             I/O BASE ADDRESS

    I/O     SW3/1   SW3/2   SW3/3   SW3/4   SW3/5   SW3/6   SW3/7   SW3/8

     2E0h   On      On      Off     On     Off     Off     Off      On

      2F0h   On      On      Off     On     Off     Off     Off     Off

      300h   On      On      Off     Off     On      On      On      On

      310h   On      On      Off     Off     On      On      On     Off

      320h   On      On      Off     Off     On      On     Off      On

      330h   On      On      Off     Off     On      On     Off     Off

      340h   On      On      Off     Off     On     Off      On      On

      350h   On      On      Off     Off     On     Off      On     Off

      360h   On      On      Off     Off     On     Off     Off      On

      370h   On      On      Off     Off     On     Off     Off     Off

      380h   On      On      Off     Off    Off      On      On      On

      390h   On      On      Off     Off    Off      On      On     Off

      3A0h   On      On      Off     Off    Off      On     Off      On

      3B0h   On      On      Off     Off    Off      On     Off     Off

      3C0h   On      On      Off     Off    Off     Off      On      On

      3D0h   On      On      Off     Off    Off     Off      On     Off

      3E0h   On      On      Off     Off    Off     Off     Off      On

      3F0h   On      On      Off     Off    Off     Off     Off     Off

  Note: When operating in enhanced mode it is not necessary to set the
  I/O address.

[Image]

                             DIAGNOSTIC LED(S)

    LED        Color        Status                  Condition

     1          Red           On           Data is being transmitted or
                                                    receiving

     1         Green          On        Card is not configured correctly

     2         Green       Blinking      Card is configured correctly and
                                             is connected to network

     2          N/A          Off             Card is defective or not
                                              connected to network

                       MISCELLANEOUS NOTES

  Note:Not all components are as shown on later card revisions.

