©
National Instruments Corporation
13
NI CB-2162 User Guide
Figure 7 shows the J13 connector as an example of this termination
scheme.
Figure 7.
Termination Connectivity
Parallel Termination
Figure 8 shows a typical parallel resistor network.
Figure 8.
Example of Parallel Resistor Network
You can implement a pull-up or pull-down termination using a parallel
configuration. Insert the 10-pin parallel resistor network into the
appropriate termination socket with the common pin of the resistor network
(pin 1 in Figure 8) connected to pin 1 of the socket, as shown in Figure 7.
With jumpers W<4..7> in place, pin 1 of J13, J15, J17, and J19 are all
pulled to ground. The signal can be alternately pulled up or terminated to
a nonground voltage if you remove the jumpers and apply power to the
jumper pin connected to pin 1 of the socket.
Alternatively, the common pin of the parallel resistor network shown
in Figure 7 can be inserted into pin 10 of the socket shown in Figure 8.
External power can then be applied to the connection point located below
pin 10 of the socket to provide proper termination.
Thevenin (Dual) Termination
In some applications, you might need to provide a Thevenin (dual)
termination or a pull-up and pull-down configuration. Figure 9 shows a
typical dual-termination resistor network, which can accomplish this task.
W4
TERMINATION
1
J13
1
10
