101-0389 Rabbit Semiconductor, 101-0389 Datasheet - Page 34
101-0389
Manufacturer Part Number
101-0389
Description
CARD DGTL I/O 16/8 SNKNG SR9200
Manufacturer
Rabbit Semiconductor
Datasheet
1.101-0437.pdf
(184 pages)
Specifications of 101-0389
Accessory Type
Smart Star Digital I/O Card
For Use With/related Products
SR9200
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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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.
34
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)
W
W
W
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