User's Manual l MB-SMARC-3 UM 0100 l © 2022, TQ-Systems GmbH
Page 12
3.6.5
Gigabit Ethernet
The MB-SMARC-3 provides two common 10/100/1000 Mbps speed Gigabit Ethernet ports. For both ports the Ethernet signals of
the SMARC module are used.
Table 5:
Function of Ethernet LEDs
LED Colour
Function
Green
Link is up (Link is connected)
Orange / Yellow
Act (Blinks at data transfer)
Illustration 7:
RJ45 Connectors, X8
3.6.6
Serial Interfaces (RS-232)
The MB-SMARC-3 provides up to six serial ports:
•
RS-232 port at on-board connectors X35, X36, X42, X43, X47, X48
The SMARC specification does provide following signal definitions for the serial ports:
•
Rx / Tx / RTS / CTS for port 0 and 2
•
Rx / Tx for port 1 and 3
RS-232 connector: For usage of the RS-232 ports with an adapter cable (see chapter Accessories 2.4)
•
Connector type:
Molex 53398-1071
•
Mating connector:
Molex 51021-1000
Table 6:
RS-232 D-Sub Connector
Illustration 8:
Molex Connector and
RS-232 D-SUB Connector
An ESPI UART is realized on the MB-SMARC-3 to support two more serial ports. SER5 is equipped with an RS232 / RS485 / RS422
multilevel transceiver.
Please contact
for further information about available serial ports.
Note: Typo on PCB
The note on the PCB about the DIP switch S4 refers to SER4, which is unfortunately wrong. The switches
influence SER5 !
Pin
RS-232 Signal
(all signals)
MB-SMARC-3
D-Sub connector
(with DSUB-Adaptor)
1
DCD
NC
–
2
DSR
NC
RXD
3
RXD
RXD
TXD
4
RTS
RTS
–
5
TXD
TXD
GND
6
CTS
CTS
–
7
DTR
NC
RTS
8
RI
NC
CTS
9
GND
GND
–
10
–
NC
–
1
