Evaluation Board User Guide
EVALUATION BOARD HARDWARE CONFIGURATION
TEST SETUP
The
evaluation board is shown
in Figure 2 with the default jumper settings on LK1 through
LK4 (driver and receiver enabled), power connection on J1,
input signal connection on J2, and probes attached to RXD,
TXD, Y, and Z for a loopback test (LK5 and LK6 are closed
to connect A to Y and B to Z).
UG-317
JUMPER SETTINGS
The inputs to the
can be configured
using the jumpers on the evaluation board (see Table 1). Note
that multiple jumper blocks should not be placed on LK1 to
LK4 because the input sources may be shorted together. For
each link, a single jumper block can be moved from one posi-
tion to another, as specified in Table 1.
SIGNAL
GENERATOR
3.3V OR 5V
POWER
SUPPLY
OSCILLOSCOPE
J1
GND1
J3
RXD
RXD
LK1
A
B
VCC
RXD
RE
DE
TXD
GND2
A
B
Z
Y
VISO
LK6
LK5
A
B
Z
Y
SHIELD
J4
10174-010
EVAL-ADM2682E_87EEBZ
DE
TXD
TXD
J2
Figure 2. Basic Operation of the Evaluation Board for the
Isolated RS-485 Transceivers
Table 1. Jumper Configuration
Link
LK1
LK2
Connection
A
B
A
B
C
D
Description
Connects the receiver output (RxD) of the
to the J3 connector.
Connects the receiver output (RxD) of the
to the J8-1 terminal block connector.
Connects the receiver enable input (RE) of the
to V
CC
. This setting disables the receiver.
Connects the receiver enable input (RE) of the
to GND
1
. This setting enables the receiver.
Connects the receiver enable input (RE) of the
to the J8-2 terminal block connector.
Connects the receiver enable input (RE) of the
to the driver enable input (DE); that is, the
input for both RE and DE is set by LK3. This setting ensures that when the driver is enabled, the receiver is
disabled, or when the driver is disabled, the receiver is enabled.
Connects the driver enable input (DE) of the
to V
CC
. This setting enables the driver.
Connects the driver enable input (DE) of the
to GND
1
. This setting disables the driver.
Connects the driver enable input (DE) of the
to the J8-3 terminal block connector.
Connects the driver input (TxD) of the
to the J8-4 terminal block connector.
Connects the driver input (TxD) of the
to the J2 connector.
Connects the
Receiver Input A to Driver Output Y. When LK5 and LK6 are both connected,
the evaluation board is configured for half-duplex operation.
When LK5 and LK6 are both open, the evaluation board is configured for full-duplex operation.
Connects the
Receiver Input B to Driver Output Z. When LK5 and LK6 are both connected,
the evaluation board is configured for half-duplex operation.
When LK5 and LK6 are both open, the evaluation board is configured for full-duplex operation.
LK3
LK4
LK5
A
B
C
A
B
Closed
Open
Closed
Open
LK6
J8
RE
LK2 A
B
C
D
LK3
A
B
C
LK4
A
B
Rev. 0 | Page 3 of 12
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