20-101-0732 Rabbit Semiconductor, 20-101-0732 Datasheet - Page 41
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20-101-0732
Manufacturer Part Number
20-101-0732
Description
INTERFACE SMART SCREEN OP7100
Manufacturer
Rabbit Semiconductor
Datasheet
1.101-0303.pdf
(126 pages)
Specifications of 20-101-0732
Module/board Type
Single Board Computer Module
For Use With/related Products
OP7100
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
20-101-732
20-101-732
20-101-732
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Any Rabbit Semiconductor controller or the OP7100 can be a master or a
slave. A network can have up to 255 slaves, but only one master.
A multidrop network requires termination/bias resistors to minimize reflec-
tions (echoing) and to keep the network line active during an idle state. The
OP7100 termination resistors are already installed, and by default are en-
abled by having jumpers installed on header J9. Remove the jumpers from
header J9, as shown in Figure 3-21, to disable or remove the termination
resistors. Only the first and last devices on a multidrop RS-485 network should
have the termination resistors enabled.
FD
J9
J10
Figure 3-21. Enabling/Disabling Termination Resistors
Only a single, solid conductor should be placed in a screw clamp terminal.
Bare copper, particularly if exposed to the air for a long period before
installation, can become oxidized. The oxide can cause a high-resistance
(~20 Ω) connection, especially if the clamping pressure is not sufficient.
To avoid oxidation, use tinned wires or clean, shiny copper wire. If you are
using multiple conductors or stranded wire, consider soldering the wire
bundle or using a crimp connector to avoid a later loss of contact pressure
to a spontaneous rearrangement of the wire bundle. Note that soldering a
stranded wire may make the wire subject to fatigue failure at the junction
with the solder if there is flexing or vibration.
OP7100
Hardware 41
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