5
REV. 1.0.0
XR21V1414 EVALUATION BOARD USER’S MANUAL
2.2
Jumper Settings
2.2.1
Common jumpers
Common jumpers are those jumpers which should be set the same for both RS-232 and RS-485 mode. The
Table 2
shows the common jumpers setting on the evaluation board:
T
ABLE
2: C
OMMON
J
UMPERS
S
ETTINGS
J
UMPERS
L
OCATION
F
UNCTIONS
C
OMMENTS
JP1
Top
Power source select
Not installed. Trace between pin 2&3.
■
Jumper in 1&2 selects power from external power
supply of 5V
■
Jumper in 2&3 selects power from USB V
BUS
power
JP2
Top
SCL pull-up/pull-down resistor select Jumper in 1&2 selects pull-up for SCL
Jumper in 2&3 selects pull-down for SCL
JP3
Top
SDA pull-up/pull-down resistor select Jumper in 1&2 selects pull-up for SDA
Jumper in 2&3 selects pull-down for SDA
JP4
Top
I2C EEPROM header
Jumper in 1&2 connects SCL to I2C EEPROM
Jumper in 3&4 connects SDA to I2C EEPROM
N
OTE
:
I2C EEPROM has not been programmed
JP5
Top
Selects RS-232 or RS-485 mode for
Channel A
Jumper in 1&2 selects RS-485 mode
Jumper in 2&3 selects RS-232 mode (default)
JP6
Top
Selects RS-232 or RS-485 mode for
Channel B
Jumper in 1&2 selects RS-485 mode
Jumper in 2&3 selects RS-232 mode (default)
JP7
Top
Selects RS-232 or RS-485 mode for
Channel C
Jumper in 1&2 selects RS-485 mode
Jumper in 2&3 selects RS-232 mode (default)
JP8
Top
Selects RS-232 or RS-485 mode for
Channel D
Jumper in 1&2 selects RS-485 mode
Jumper in 2&3 selects RS-232 mode (default)
JP25
Top
Power supply for XR21V1414
Not installed. Trace between pin 1&2
JP26
Top
UART side Channel A external loop-
back header
Jumper in enables external loopback for channel A in the
UART side
N
OTE
:
External loopback via this jumper can only be
performed when the transceiver has been
disabled.
JP27
Top
UART side Channel B external loop-
back header
Jumper in enables external loopback for channel B in the
UART side
N
OTE
:
External loopback via this jumper can only be
performed when the transceiver has been
disabled.
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