mbusd doesn't work via systemd

[ddokupil]

At my configurations, both RPI3 with openhabian ands NanoPI mbusd works fine when executed by
$sudo mbusd -L/tmp/mbusd.log -p /dev/ttyUSB0 -s 9600 -P 502 -d -v9
but fails when started as a service with no error indicated:

Oct 04 13:41:59 openhab mbusd[6494]: 04 Oct 2020 13:41:59 conn_open(): accepting connection from 192.168.1.196
Oct 04 13:42:00 openhab mbusd[6494]: 04 Oct 2020 13:42:00 conn_close(): closing connection from 192.168.1.196
Oct 04 13:42:01 openhab mbusd[6494]: 04 Oct 2020 13:42:01 conn_open(): accepting connection from 192.168.1.196
Oct 04 13:42:02 openhab mbusd[6494]: 04 Oct 2020 13:42:02 conn_close(): closing connection from 192.168.1.196

But my modbus SW shows timeout.

My config file:

sudo nano /etc/mbusd/mbusd-ttyUSB0.conf

# Serial port device name
device = /dev/ttyUSB0
# Serial port speed (Folow on your PLC or Modbus Device config)
speed = 9600
# Serial port mode (Folow on your PLC or Modbus Device config)
mode = 8e1
# RS-485 data direction control type (addc, rts, sysfs_0, sysfs_1)
trx_control = addc
# Sysfs file to use to control data direction
# trx_sysfile =
############# TCP port settings #############
# TCP server port number
port = 502
# Maximum number of simultaneous TCP connections
maxconn = 64
# Connection timeout value in seconds
timeout = 60
######### Request/response settings #########
# Maximum number of request retries
retries = 3
# Pause between requests in milliseconds
pause = 100
# Response wait time in milliseconds
wait = 500

[3cky]

Hello @ddokupil, sorry for such a late response.

mode = 8e1

Are you sure you need 8e1 and not 8n1 mode here? You wrote it works fine when you run mbusd from the command line with default mode which is 8n1.

[stale]

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