Rs-232 Serial Interfaces; Table 3-9. Rs-232 Signals - Lantronix XPort AR Integration Manual

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.
Signal
DCDA (CP05)
RXDA
TXDA
DTRA (CP02)
GND
DSRA (CP04)
RTSA (CP01)
CTSA (CP03)
--
DCDB (CP11)
RXDB (CP07)
TXDB (CP06)
DTRB (CP09)
GND
DSRB (CP11)
RTSB (CP08)
CTSB (CP10)
--
XPort AR Integration Guide

Table 3-9. RS-232 Signals

XPort AR
Pin # Jumper Direction
7 JP6, 13-14 In
12 JP6, 7-8 In
9 JP6, 1-2 Out
16 JP6, 5-5 Out
4 -- --
3 JP6, 11-12 In
13 JP6, 3-4 Out
17 JP6, 9-10 In
-- -- --
19 JP8, 3-2 In
10 JP7, 7-8 In
2 JP7, 1-2 Out
6 JP7, 5-6 Out
4 -- --
19 JP8, 1-2 In
1 JP7, 3-4 Out
20 JP7, 9-10 In
-- -- --
3: Evaluation Kit
PC
DE-9 Pin # Connection
P1-1 --
P1-2 TXD
P1-3 RXD
P1-4 DSR
P1-5 GND
P1-6 DTR
P1-7 CTS
P1-8 RTS
P1-9 --
P2-1 --
P2-2 TXD
P2-3 RXD
P2-4 DSR
P2-5 GND
P2-6 DTR
P2-7 CTS
P2-8 RTS
P2-9 --
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