Access to the RS-485 port of the Wiren Board controller from a computer

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Attention! These instructions should only be performed on a private subnet. Do not allow RS-485 ports to be accessed over TCP if the Wiren Board is accessible over a real IP from the outside.

Let's say the Wiren Board has 192.168.3.12 IP address.

Run this commands on Wiren Board from root access:

apt-get install socat
service wb-mqtt-serial stop    

In older versions of controllers, use the serive wb-homa-modbus stop command.

socat -d -d -d -x /dev/ttyRS485-1,raw,ispeed=9600,ospeed=9600,parenb=0,cstopb=1,cs8 TCP-LISTEN:10010&
socat -d -d -d -x /dev/ttyRS485-2,raw,ispeed=9600,ospeed=9600,parenb=0,cstopb=1,cs8 TCP-LISTEN:10011&

In older versions of controllers, specify ports [/dev/ttyNSC0, /dev/ttyNSC1] or [/dev/ttyAPP1, /dev/ttyAPP4].


Note the coding of the number of stop bits:

  • cstopb=1 — 2 stop bits,
  • cstopb=0 — 1 stop bit.

Option cstopb has the Boolean type; refer to the man socat articles online.


The second command (service wb-mqtt-serial stop) is to stop the Modbus driver to avoid conflicts when working with RS-485 ports.

Run on a computer (Linux based):

socat -d -d -d -x PTY,raw,ispeed=9600,ospeed=9600,parenb=0,cstopb=1,cs8,link=/dev/ttyRS485-1 tcp:192.168.3.12:10010&
socat -d -d -d -x PTY,raw,ispeed=9600,ospeed=9600,parenb=0,cstopb=1,cs8,link=/dev/ttyRS485-2 tcp:192.168.3.12:10011&
sudo ln -fs /tmp/ttyRS485-{1,2} /dev

In older versions of controllers, specify ports [/dev/ttyNSC0, /dev/ttyNSC1] or [/dev/ttyAPP1, /dev/ttyAPP4].

After executing these commands, special files /dev/ttyRS485-1 and /dev/ttyRS485-2 appear in the system (on the PC), corresponding to RS-485 ports of the Wiren Board. The latter command creates symbolic links to port files in /dev for convenience, which allows, for example, to use the Modbus driver configuration written for the Wiren Board on a PC without any changes.

The -d and -x options can be omitted in both cases - they are needed for diagnostic output and hexadecimal data dumps.