GPIO pin assignments for EPC-R3720/UIO-4030

Technical Supports
1

There are wikis that describe GPIOs for the EPC-R5710, but none for the EPC-R3720.
http://ess-wiki.advantech.com.tw/view/GPIO
How are the GPIO pin assignments for the EPC-R3720 defined?

Thanks.

2

Hi, Please check the link below for UIO-4030 user guide on EPC-R3720 wiki page.
UIO-4030 - ESS-WIKI (advantech.com.tw)

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There is GPIO pin assignment information:
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1 Like
3

Thanks for infomation! I had overlooked it.
Is DB9-5 GND?

4 
echo 505 > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio1/direction
echo 1 > /sys/class/gpio/gpio1/value

I have executed the above command and connected the buzzer to DB9-6 and DB9-5 (possibly GND) but no sound.
Am I doing something wrong?
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5

Hi,

Could you try to short DB9-1 and DB9-6 for testing? And check if the DB9-1(DI1) can read the 1 status of the DB9-6(DO1).

6

Hi @Jems_Cheng
DB9-1 can read 1 from DB9-6.
( I re-implemented it and it can read 1. sorry)

7

Dear advantech.
The test section is blank on Wiki, Did you test the GPIOs by lighting LEDs, etc.?
Did you just short DI and DO?
http://ess-wiki.advantech.com.tw/view/UIO-4030

8

HI Kawahara ,

Thank you for your instruction and read attentively. It’s a typo on this UIO device testing page when we created the UIO device testing page.
Addationally , we already removed the blank section . and hope that it doesn’t inconvenience you too much.