Q. How many Serial Connections can I have with Fitlet2?


Fitlet2 can support up to 3 Serial Connection including the following:

    -1x SoC UART RS232 on SBC - Mini Serial Port Connector.

    -1x Serial Port RS232/485 Full/Half Duplex configurable with FSCG-Kit - RJ45 Connector.


Q. How can I configure the Serial I want? (RS232/RS485 Full/ Half duplex)


The mini Serial Connector accessible from the SBC has only RS232 capabilities. 

For specific configuration, you can use the FSCG-Kit:


Configure the 2 switch on the FACET SBC:


SW2
SW1
ON
RS232
Full Duplex
OFF
RS485
Half Duplex









Q. What is the Connection of the Ultra Mini Serial Connector?


Using the Accessory cables:

- CABDB9UMP  (DB9-Female)

- ACCENC-ADPUMSER (DB9-Male) 



DB9-M

Ultra Mini serial

RS232 Signal

3

1

TX

7

2

RTS

2

3

RX

8

4

CTS

4

5

Not Connected

6

6

Not Connected

x

7

Not Connected

5

8

GND


Q.  What is the connection for the RS232 and RS485 with the FSCG-Kit FACET?


The connector on the FACET is one RJ45 Port. 


rj45 



Connector is RJ45. No Cable is provided with the FACET.


RJ45 Female Receptacle PINOUT:

RJ45
RS232
RS485H
RS485F
Pin
Signal
Signal
Signal
1
RTS
TXN/RXN
TXN
2
DTR


3
TXD
TXP/RXP
TXP
4
GND
GND
GND
5
GND
GND
GND
6
RXD

RXP
7
DSR


8
CTS

RXN

 

RJ45 Male Plug PINOUT:

RJ45
RS232
RS485H
RS485F
Pin
Signal
Signal
Signal
1
CTS
TXN/RXN
RXN
2
DTR


3
RXD
TXP/RXP
RXP
4
GND
GND
GND
5
GND
GNDGND
6
TXD

TXP
7
DSR


8
RTS

TXN



Q. [Windows] Which COM Port from the Device Manager should I use?


If you use the FSCG-Kit, you will need to aut-update the drivers and you will get 4 COM Ports.

The 2 UartSub Device are the 2 com Ports from the CPU. One of them only can be used as the other is reserved and not accessible from the sides of the SBC.

The 2 USB Serial Port are provided thanks to the FACET. THey have 2 different functions:

- 1 is used for the CAN BUS - NOT AVAILABLE

- 1 is used for the RS232/485 connection.


You can recognise which one is the correct one thanks to the properties:


Q. [Linux] Which COM Port from the Devices should I use?


If you search for Serial Ports: #: dmesg | grep tty

you will get