Changing Bias Resistors - National Instruments ENET-232 Series User Manual

Chapter 6 Using Your Serial Device Server

Changing Bias Resistors

ENET-232 and ENET-485 Series User Manual
Rather than using two 620 Ω resistors at one node, you can increase the
value of the resistors and put them at every node. For example, if there are
eight nodes in a system, you can use 4.7 kΩ resistors at each node to
effectively achieve the same result.
Complete the following steps to change the bias resistors on the
ENET-485 Series.
1. Power off the serial device server and disconnect the cables.
2. Remove the four screws on the bottom baseplate. Slide the top cover
away from the rear panel and then up, as shown in Figure 6-3.
Figure 6-3. Removing the Top Cover
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