StarSBC-6ULL RS485 example - Revision history

Piotrzbysinski: /* Loop test */

2022-12-13T08:59:16Z

Loop test

← Older revision		Revision as of 08:59, 13 December 2022
Line 5:		Line 5:
	=== Loop test ===		=== Loop test ===

	The ~~extension~~ SLH2-comm board has two RS485 interfaces available so they may be connected to perform the test in a loop. All signals are available on the J201 connector. They should be connected according to the following table:		The SLH2-comm extension board has two RS485 interfaces available so they may be connected to perform the test in a loop. All signals are available on the J201 connector. They should be connected according to the following table:

	{\| class="wikitable"		{\| class="wikitable"

Piotrzbysinski: /* Loop test */

2022-12-13T08:58:04Z

Loop test

← Older revision		Revision as of 08:58, 13 December 2022
Line 5:		Line 5:
	=== Loop test ===		=== Loop test ===

	The extension board has two RS485 interfaces available so they may be connected to perform the test in a loop. All signals are available on the J201 connector. They should be connected according to the following table:		The extension SLH2-comm board has two RS485 interfaces available so they may be connected to perform the test in a loop. All signals are available on the J201 connector. They should be connected according to the following table:

	{\| class="wikitable"		{\| class="wikitable"

Piotrzbysinski at 08:57, 13 December 2022

2022-12-13T08:57:25Z

← Older revision		Revision as of 08:57, 13 December 2022
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	{{PageHeader\|StarSBC-6ULL RS485 example}} __toc__		{{PageHeader\|StarSBC-6ULL RS485 example}} __toc__

	This tutorial shows how to send and receive data using RS485 interface on StarSBC-6ULL with communication extension board. The default Yocto image contains all required software tools.		This tutorial shows how to send and receive data using RS485 interface on StarSBC-6ULL with communication extension board SLH2-comm. The default Yocto image contains all required software tools.

	=== Loop test ===		=== Loop test ===

KrzysztofChojnowski at 15:22, 25 May 2022

2022-05-25T15:22:28Z

← Older revision		Revision as of 15:22, 25 May 2022
Line 1:		Line 1:
	{{PageHeader\|StarSBC-6ULL RS485 example}} __toc__		{{PageHeader\|StarSBC-6ULL RS485 example}} __toc__

	This tutorial shows how to send and receive data using RS485 interface on StarSBC-6ULL with communication extension board. The default Yocto image ~~build according the tutorial [[VisionSOM_imx-meta-somlabs-hardknott]]~~ contains all required software tools.		This tutorial shows how to send and receive data using RS485 interface on StarSBC-6ULL with communication extension board. The default Yocto image contains all required software tools.

	=== Loop test ===		=== Loop test ===

KrzysztofChojnowski at 14:39, 25 May 2022

2022-05-25T14:39:09Z

← Older revision		Revision as of 14:39, 25 May 2022
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	\| RS485-2B (pin 2)		\| RS485-2B (pin 2)
	\|}		\|}

			[[File:StarSBC-6ULL-SLH2-rs485-loop.jpg\|center\|500px]]

	Both interfaces are already defined in the default module device-tree and are recognized as /dev/ttymxc3 and /dev/ttymxc7 devices. The device files may be used directly for reading and writing and the bitrate may be set using the stty tool:		Both interfaces are already defined in the default module device-tree and are recognized as /dev/ttymxc3 and /dev/ttymxc7 devices. The device files may be used directly for reading and writing and the bitrate may be set using the stty tool:
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	root@starsbc-6ull:~#		root@starsbc-6ull:~#
	</pre>		</pre>

	~~[[File:StarSBC-6ULL-SLH2-rs485-loop.jpg\|center\|500px]]~~

	=== RS485/USB converter test ===		=== RS485/USB converter test ===

KrzysztofChojnowski at 14:38, 25 May 2022

2022-05-25T14:38:51Z

← Older revision		Revision as of 14:38, 25 May 2022
Line 31:		Line 31:
	</pre>		</pre>

			[[File:StarSBC-6ULL-SLH2-rs485-loop.jpg\|center\|500px]]

	=== RS485/USB converter test ===		=== RS485/USB converter test ===

KrzysztofChojnowski: Created page with "{{PageHeader|StarSBC-6ULL RS485 example}} toc This tutorial shows how to send and receive data using RS485 interface on StarSBC-6ULL with communication extension board. T..."

2022-02-03T15:47:06Z

Created page with "{{PageHeader|StarSBC-6ULL RS485 example}} __toc__ This tutorial shows how to send and receive data using RS485 interface on StarSBC-6ULL with communication extension board. T..."

New page

{{PageHeader|StarSBC-6ULL RS485 example}} __toc__

This tutorial shows how to send and receive data using RS485 interface on StarSBC-6ULL with communication extension board. The default Yocto image build according the tutorial [[VisionSOM_imx-meta-somlabs-hardknott]] contains all required software tools.

=== Loop test ===

The extension board has two RS485 interfaces available so they may be connected to perform the test in a loop. All signals are available on the J201 connector. They should be connected according to the following table:

{| class="wikitable"
|-
! RS485-1 signal
! RS485-2 signal
|-
| RS485-1A (pin 3)
| RS485-2A (pin 1)
|-
| RS485-1B (pin 4)
| RS485-2B (pin 2)
|}

Both interfaces are already defined in the default module device-tree and are recognized as /dev/ttymxc3 and /dev/ttymxc7 devices. The device files may be used directly for reading and writing and the bitrate may be set using the stty tool:

<pre>
root@starsbc-6ull:~# stty -F /dev/ttymxc3 9600 raw -echo -echoe -echok
root@starsbc-6ull:~# stty -F /dev/ttymxc7 9600 raw -echo -echoe -echok
root@starsbc-6ull:~# cat /dev/ttymxc3 &
[1] 465
root@starsbc-6ull:~# echo "123" > /dev/ttymxc7
123
root@starsbc-6ull:~#
</pre>

=== RS485/USB converter test ===

This example requires the [https://kamami.pl/konwertery-rs485/574851-modusb-rs485-modul-konwertera-usb-rs-485.html RS485/USB converter] connected to the StarSBC-6ULL board and PC with Linux host.

After connecting the RS485-1A and RS485-1B signals to the converter attached to the PC the stty, cat and echo commands may be used to configure, read and write both ports. In this example the host interface was recognized as /dev/ttyUSB1:

<pre>
dev@somlabs:~$ dmesg | tail
[25050.725905] usb 1-4.1: new full-speed USB device number 61 using xhci_hcd
[25050.837144] usb 1-4.1: New USB device found, idVendor=1a86, idProduct=7523, bcdDevice= 2.64
[25050.837146] usb 1-4.1: New USB device strings: Mfr=0, Product=2, SerialNumber=0
[25050.837148] usb 1-4.1: Product: USB Serial
[25050.845068] ch341 1-4.1:1.0: ch341-uart converter detected
[25050.846044] usb 1-4.1: ch341-uart converter now attached to ttyUSB1
</pre>

On StarSBC-6ULL target:
<pre>
stty -F /dev/ttymxc7 9600 raw -echo -echoe -echok
cat /dev/ttymxc7
</pre>

On host:
<pre>
stty -F /dev/ttyUSB1 9600 raw -echo -echoe -echok
echo "123" > /dev/ttyUSB1
</pre>

StarSBC-6ULL RS485 example - Revision history

Piotrzbysinski: /* Loop test */

Piotrzbysinski: /* Loop test */

Piotrzbysinski at 08:57, 13 December 2022

KrzysztofChojnowski at 15:22, 25 May 2022

KrzysztofChojnowski at 14:39, 25 May 2022

KrzysztofChojnowski at 14:38, 25 May 2022

KrzysztofChojnowski: Created page with "{{PageHeader|StarSBC-6ULL RS485 example}} __toc__ This tutorial shows how to send and receive data using RS485 interface on StarSBC-6ULL with communication extension board. T..."

KrzysztofChojnowski: Created page with "{{PageHeader|StarSBC-6ULL RS485 example}} toc This tutorial shows how to send and receive data using RS485 interface on StarSBC-6ULL with communication extension board. T..."