Transclusion: IOT-GATE-iMX8: RS485 / RS232 - Revision history

Igor at 12:45, 5 December 2022

2022-12-05T12:45:39Z

imported>Uri.mashiach: /* Example */

2022-07-25T06:14:20Z

‎Example

imported>Uri.mashiach at 10:59, 29 June 2021

2021-06-29T10:59:06Z

imported>Igor.vaisbein: /* RS485 / RS232 Selection */

2020-12-23T11:05:17Z

‎RS485 / RS232 Selection

imported>Uri.mashiach: Created page with "IOT-GATE-iMX8 / SBC-IOT-iMX8 features a half-duplex RS485 port.
The RS485 interface is routed to rear panel terminal block connector ([http://192.168.10.106/mediawiki/inde..."

2020-09-14T08:20:57Z

Created page with "IOT-GATE-iMX8 / SBC-IOT-iMX8 features a half-duplex RS485 port.<br> The RS485 interface is routed to rear panel terminal block connector ([http://192.168.10.106/mediawiki/inde..."

New page

IOT-GATE-iMX8 / SBC-IOT-iMX8 features a half-duplex RS485 port.<br>
The RS485 interface is routed to rear panel terminal block connector ([http://192.168.10.106/mediawiki/index.php/IOT-GATE-iMX8:_Getting_Started#Front_and_Rear_panels see drawing]).<br>
RS485 / RS232 connector pin-out in RS485 mode:

{| width="40%" cellspacing="1" cellpadding="1" border="1"
|-
| align="center" | '''Pin Number'''
| align="center" | '''RS485 Functionality'''
|- valign="top"
| 1
| NEG A/-
|-
| 2
| NEG B/+
|-
| 3
| Ground
|-
| 6
| Ground
|-
|}

== Example ==
Serial terminal emulator application can be used to test the RS485 port.
* Use the following command to start Minicom with the user space device of the RS485 ('''/dev/ttymxc0''').
<pre>
root@iot-gate-imx8:~# minicom -D /dev/ttymxc0
</pre>
* Follow the following steps to disable hardware flow control
** Open the menu "Configure Minicom" with CTRL-a followed by the letter 'o'.
** Select "Serial port setup"
** Press the letter 'f'.
** Press the Esc key twice.
* The characters that are typed in the terminal are transmitted to the RS485 port.
* The characters that are received from the RS485 port are displayed in the terminal.
* Press CTRL-a followed by the letter 'x' to exit from Minicom

@@ Line 37: / Line 37: @@
 == RS485 / RS232 Mode Selection ==
 The UART mode is stored in the U-Boot environment.<br>
-U-Boot environmnet commands are used to set/get the UART mode.
+U-Boot environment commands are used to set/get the UART mode.
 === Set RS485 mode ===
 <pre>
-root@iot-gate-imx8:~# cl_setenv uart_mode rs485
+root@iot-gate-imx8:~# fw_setenv uart_mode rs485
 root@iot-gate-imx8:~# reboot
 </pre>
 === Set RS232 mode ===
 <pre>
-root@iot-gate-imx8:~# cl_setenv uart_mode rs232
+root@iot-gate-imx8:~# fw_setenv uart_mode rs232
 root@iot-gate-imx8:~# reboot
 </pre>
@@ Line 52: / Line 52: @@
 root@iot-gate-imx8:~# fw_printenv uart_mode
 </pre>
 == Example ==

@@ Line 1: / Line 1: @@
 IOT-GATE-iMX8 / SBC-IOT-iMX8 features a RS485 / RS232 port. Only half-duplex mode is supported for the RS485.<br>
-The RS485 / RS232 interface is routed to rear panel terminal block connector ([http://192.168.10.106/mediawiki/index.php/IOT-GATE-iMX8:_Getting_Started#Front_and_Rear_panels see drawing]).<br>
+The RS485 / RS232 interface is routed to rear panel terminal block connector [[IOT-GATE-iMX8: Getting Started#Front_and_Rear_panels|see drawing]].<br>
 RS485 / RS232 connector pin-out:

@@ Line 63: / Line 63: @@
 ** Select "Serial port setup"
 ** Press the letter 'f'.
 ** Press the Esc key twice.
 * The characters that are typed in the terminal are transmitted to the RS485 port.
 * The characters that are received from the RS485 port are displayed in the terminal.
 * Press CTRL-a followed by the letter 'x' to exit from Minicom