3
SLCU001 – May 2016
Copyright © 2016, Texas Instruments Incorporated
TRS3122EEVM User's Guide
Connector/Test Points
DB9 Connector
DB9 Connector Pinout
The female DB9 port provides access to the TRS3122E device through a standard RS-232 pinout. The
TRS3122E female port is DCE to mate with a computer's male DTE port. The pin names are
counterintuitive on the DCE side. For example the RX pin on EVM is connected to a driver and TX
connects to a receiver.
•
Pins 1 and 9 are not connected.
•
Pins 2, 3, 7, 8 provide access to the RS-232 communication lines RX1, TX1, RTS1, CTS1 respectively.
•
Pins 4 and 6 are shorted together by a 0
Ω
resistor to loopback the unused handshaking lines.
•
Pin 5 is grounded.
Screw Terminal Connector
Screw Terminal Connector Pinout
The screw terminal port provides access to the TRS3122E device communication pins as well as control,
output, and power pins. Note that pins are numbered from left to right in the description below.
•
Pins 1 through 4 provide access to the logic communication lines CTS2, RX2, RTS2, and TX2
respectively.
•
Pin 5 connects to the INVALID pin, which has the function described by the
Table.
INVALID Pin Function
INPUTS
OUTPUT
RIN1, RIN2
FORCEON
FORCEOFF
TIME ELAPSED SINCE LAST
RIN OR DIN TRANSITION
INVALID
Any L or H
X
X
X
H
All Open
X
X
X
L
•
Pin 6 connects to the FORCEOFF pin, and Pin 7 connects to the FORCEON pin. Please see the
and the
for pin functions.
