Difference between revisions of "VAR-SOM-AM43 RS485-Port"

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= RS-485 port =
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{{PageHeader|VAR-SOM-AM43 - RS-485 Port}} {{DocImage|category1=VAR-SOM-AM43|category2=Yocto}} __toc__
 
Please do the following to enable and test RS-485 port: <br>
 
Please do the following to enable and test RS-485 port: <br>
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1. Perform a loopback at RS-485 port by shorting pins 1 to 3 and 2 to 4 on J11 (on the carrier board).
 
1. Perform a loopback at RS-485 port by shorting pins 1 to 3 and 2 to 4 on J11 (on the carrier board).
  

Latest revision as of 15:30, 24 December 2015

VAR-SOM-AM43 - RS-485 Port

Please do the following to enable and test RS-485 port:

1. Perform a loopback at RS-485 port by shorting pins 1 to 3 and 2 to 4 on J11 (on the carrier board).

2. Type the following commands in the Linux shell to enable:

$ echo 168 > /sys/class/gpio/export
$ echo "out" > /sys/class/gpio/gpio168/direction
$ echo 0 > /sys/class/gpio/gpio168/value

# Tx enable: gpio173

$ echo 173 > /sys/class/gpio/export
$ echo "out" > /sys/class/gpio/gpio173/direction
$ echo 1 > /sys/class/gpio/gpio173/value

3. Start minicom

$ minicom -D/dev/ttyO2 -b115200 -8

4. Type a few characters at the minicom and see that the loopback is working.