101-0506 Rabbit Semiconductor, 101-0506 Datasheet - Page 34

• Manufacturer Part Number: 101-0506
• Description: CARD CPU SR9160 128K SRAM SMRTST
• Manufacturer: Rabbit Semiconductor

Specifications of 101-0506

• Accessory Type: Smart Star CPU Card
• For Use With/related Products: SR9160
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

The CPU Card comes with a 220 Ω termination resistor and 681 Ω bias resistors already
installed and enabled with jumpers across pins 1–2 and 5–6 on header JP1, as shown in
Figure 12.
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 Smart Star units in the network by removing both jumpers from
header JP1.
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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 CPU Card.
Figure 12. RS-485 Termination and Bias Resistors
Smart Star (SR9000)
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