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3.2.5.7
Serial port interface signals (Connector X3 - CN8)
®
According to ETX
Rel. 3.0 specifications, the ETX-A61 module offers two UART interfaces, which are managed by the LPC Super I/O Nuvoton W83627DHG.
Here following the signals related to UART interfaces:
DTR1#, DTR2#: Data Terminal Ready active low outputs, 3.3V_S electrical level. This is a handshake signal used to notify to the DCE (Data Communication
Equipment) that the DTE (Data Terminal Equipment) is ready to establish a data-communication link.
RI1#, RI2#: Ring Indicator active low inputs, 3.3V_S electrical level. This is a handshake signal that the DCE uses to signal to the DTE that a telephone ring has
been detected.
TXD1, TX2: Serial Data Transmitter outputs, 3.3V_S electrical level.
RXD1, RXD2: Serial Data Receiver inputs, 3.3V_S electrical level.
CTS1#, CTS2#: Clear To Send active low inputs, 3.3V_S electrical level. This handshake signal is used to notify to the DTE that the DCE is ready to receive data-
RTS1#, RTS2#: Request to Send active low outputs, 3.3V_S electrical level. These handshake signals are used to notify to the DCE that the DTE is ready to
transmit data.
DCD1#, DCD2#: Data Carrier Detect active low inputs, 3.3V_S electrical level. Handshake signal used to notify to the DTE that a carrier signal has been detected
by the DCE.
DSR1#, DSR2#: Data Set Ready active low inputs, 3.3V_S electrical level. Handshake signal used to notify to the DTE that the DCE is ready to establish a data-
communication link.
IRRX, IRTX: Infrared receive and transmit Data. These two signals are not a different serial port. Instead, they are hardwired, respectively, to RXD2 and TXD2 signals.
Please consider that interface is at TTL electrical level; therefore, please evaluate well the typical scenario of application. If it is not necessary to interface directly at
TTL level, for connection to standard serial ports commonly available (like those offered by common PCs, for example) it is mandatory to include an RS-232
transceiver on the carrier board.
The schematic in the next page shows an example of implementation of RS-232 transceiver for the Carrier board.
ETX-A61
ETX-A61 User Manual - Rev. First Edition: 1.0 - Last Edition: 1.2 - Author: S.B. - Reviewed by G.G. Copyright © 2017 SECO S.r.l.
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