20-101-0492 Rabbit Semiconductor, 20-101-0492 Datasheet - Page 24

• Manufacturer Part Number: 20-101-0492
• Description: MODULE OP6800 FULL-FEATURED
• Manufacturer: Rabbit Semiconductor

Specifications of 20-101-0492

• Module/board Type: Single Board Computer Module
• For Use With/related Products: OP6800
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 20-101-492; 20-101-492

The OP6800 comes with a 220 Ω termination resistor and two 681 Ω bias resistors
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 OP6800 units in the network by removing both jumpers from
header JP1.
20
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 OP6800.
Figure 12. RS-485 Termination and Bias Resistors
Figure 11. OP6800 Multidrop Network
MiniCom (OP6800)
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