and 
UART2 to USB PC connection RX/TX connection
dskumher1 Answers
kareldew answered 4 years ago
Good info, maybe it could be stressed more in the hookup guide that the IOREF pin needs to be fed some voltage for these pins to work at all. I was not aware and thought my bluetooth module was faulty.
ArdusimpleThanks for the feedback.
We have updated the Arduino rails section in the hookup guide remarking the need of connecting IOREF if custom hardware needs to be used via UART1/UART2.
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replied 4 years ago
In one question in this forum , following ( generally an exception ) TX/RX connection between serial PC & ardusimple board UART2 was shown :
PC————————————-Ardusimple(PCB Silkscreen)
Serial TX—————————————-RX1
Serial RX—————————————-TX1
Serial TX—————————————-TX2
Serial RX—————————————-RX2
Is it really true ?
Staff replied 4 years ago
Hi dskumher,
In our hookup guide we tried to summarize these connections: https://www.ardusimple.com/simplertk2b-hookup-guide/
I paste here:
TX1: ZED-F9P UART1 TX
RX1: ZED-F9P UART1 RX
TX2: XBee UART TX (this pin is also connected to ZED-F9P UART2 RX).
RX2: XBee UART RX (this pin is also connected to ZED-F9P UART2 TX).
Don’t forget to connect IOREF to enable above pins.