101-0463 Rabbit Semiconductor, 101-0463 Datasheet - Page 31

• Manufacturer Part Number: 101-0463
• Description: COMPUTER SINGLE BOARD BL2120
• Manufacturer: Rabbit Semiconductor

Specifications of 101-0463

• Module/board Type: Single Board Computer Module
• For Use With/related Products: BL2120
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

The BL2100 comes with a 220  termination resistor and two 681  bias resistors installed
and enabled with jumpers across pins 1–2 and 5–6 on header JP1, as shown in Figure 14.
For best performance, the bias and termination resistors in a multidrop network should
only be enabled on both end nodes of the network. Disable the termination and bias resis-
tors on any intervening BL2100 units in the network by removing both jumpers from
header JP1.
User’s Manual
TIP: Save the jumpers for possible future use by “parking” them across pins 1–3 and 4–6
of header JP1. Pins 3 and 4 are not otherwise connected to the BL2100.
Figure 14. RS-485 Termination and Bias Resistors
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