3: Evaluation Kit
XPort AR Integration Guide
24
PR4 is the group of holes adjacent to the pull-up header, JP4. Each of the four holes is
connected to the adjacent pin on JP4. A separate 1k pull-up resistor is connected to each of
these holes/pins. These are available for use as needed in a prototype circuit.
The four holes grouped as PR5 and the four holes grouped as GND (lower left corner of
prototyping area) are all directly connected to the signal ground plane of the evaluation
board. These eight holes provide good signal ground connections for prototype circuitry.
The eight holes grouped as 3.3V provide direct connection to the 3.3V power plane of the
evaluation board. These eight holes provide good power plane connections for prototype
circuitry.
RS-232 Serial Interfaces
The RS-232 serial interfaces are implemented with transceivers that convert 3.3V CMOS
levels to RS-232 levels. A null-modem serial cable with 9-pin connectors (F/F) is the only item
needed to connect to another DTE device such as a PC.
The table below lists the RS-232 signals.
Note:
All XPort AR serial interface signal pins, except 9 and 12, are CPs that can be
optionally set for functions other than their RS-232 function.
The jumpers in JP6, JP7, and JP8 determine whether or not the XPort AR pins are connected
to the RS-232 transceivers. When using RS-232, the signals used must have their
associated jumper installed in JP6, JP7, and JP8.
Table 3-9. RS-232 Signals
XPort AR
PC
Signal
Pin #
Jumper
Direction DE-9 Pin #
Connection
DCDA (CP05)
7
JP6, 13-14
In
P1-1
--
RXDA
12
JP6, 7-8
In
P1-2
TXD
TXDA
9
JP6, 1-2
Out
P1-3
RXD
DTRA (CP02)
16
JP6, 5-5
Out
P1-4
DSR
GND
4
--
--
P1-5
GND
DSRA (CP04)
3
JP6, 11-12
In
P1-6
DTR
RTSA (CP01)
13
JP6, 3-4
Out
P1-7
CTS
CTSA (CP03)
17
JP6, 9-10
In
P1-8
RTS
--
--
--
--
P1-9
--
DCDB (CP11)
19
JP8, 3-2
In
P2-1
--
RXDB (CP07)
10
JP7, 7-8
In
P2-2
TXD
TXDB (CP06)
2
JP7, 1-2
Out
P2-3
RXD
DTRB (CP09)
6
JP7, 5-6
Out
P2-4
DSR
GND
4
--
--
P2-5
GND
DSRB (CP11)
19
JP8, 1-2
In
P2-6
DTR
RTSB (CP08)
1
JP7, 3-4
Out
P2-7
CTS
CTSB (CP10)
20
JP7, 9-10
In
P2-8
RTS
--
--
--
--
P2-9
--