Satel Integra 64 can not connect to INT-RS

Hello,
I have Satel Integra 64 integrated with PLC using Satel`s INT-RS (Modbus RTU protocol).

I am trying to make a direct integration between Integra64 and Openhab2.8.1 using INT-RS and Satel binding (without PLC)

I have upgraded Integra 64 firmware to the last 1.19 version and the INT-RS firmware is in version 1.4 (seems the last version)

I have connected INT-RS of Integra 64 to RPI3 via USB (I have built an RS232-UART-USB convertor using MAX2323 & FT232RL for RX/DX/GND signals).

Now in the Openhab I am initializing the INT-RS bridge for satel binding but the bridge is connecting and disconnecting repetitively as follows:

2020-09-02 23:08:24.285 [DEBUG] [.satel.internal.protocol.SatelModule] - Communication thread started
2020-09-02 23:08:24.286 [INFO ] [.satel.internal.protocol.IntRSModule] - Connecting to INT-RS module at /dev/USB-satel
2020-09-02 23:08:24.295 [INFO ] [.satel.internal.protocol.IntRSModule] - INT-RS module connected successfuly
2020-09-02 23:08:24.297 [DEBUG] [.satel.internal.protocol.SatelModule] - Sending message: Message: command = 7E, payload = 
2020-09-02 23:08:24.299 [TRACE] [satel.internal.protocol.SatelMessage] - Calculated checksum = D860
2020-09-02 23:08:24.311 [TRACE] [.satel.internal.protocol.SatelModule] - Waiting for response
2020-09-02 23:08:25.281 [TRACE] [.satel.internal.protocol.SatelModule] - Checking communication thread: true, true
2020-09-02 23:08:26.281 [TRACE] [.satel.internal.protocol.SatelModule] - Checking communication thread: true, true
2020-09-02 23:08:27.263 [DEBUG] [.internal.handler.SatelBridgeHandler] - Module not initialized yet, skipping refresh
2020-09-02 23:08:27.281 [TRACE] [.satel.internal.protocol.SatelModule] - Checking communication thread: true, true
2020-09-02 23:08:28.282 [TRACE] [.satel.internal.protocol.SatelModule] - Checking communication thread: true, true
2020-09-02 23:08:29.281 [TRACE] [.satel.internal.protocol.SatelModule] - Checking communication thread: true, true
2020-09-02 23:08:29.318 [DEBUG] [.satel.internal.protocol.IntRSModule] - Closing connection to INT-RS module
2020-09-02 23:08:29.341 [INFO ] [.satel.internal.protocol.IntRSModule] - Connection to INT-RS module has been closed
2020-09-02 23:08:29.342 [DEBUG] [satel.internal.event.EventDispatcher] - Distributing event: org.openhab.binding.satel.internal.event.ConnectionStatusEvent: connected = false, reason = null
2020-09-02 23:08:29.344 [TRACE] [satel.internal.event.EventDispatcher] - Distributing to org.openhab.binding.satel.internal.protocol.IntRSModule@1d5648d
2020-09-02 23:08:29.346 [TRACE] [satel.internal.event.EventDispatcher] - Distributing to org.openhab.binding.satel.internal.handler.IntRSBridgeHandler@23d139
2020-09-02 23:08:29.349 [DEBUG] [.satel.internal.protocol.SatelModule] - Communication thread stopped
2020-09-02 23:08:30.297 [TRACE] [.satel.internal.protocol.SatelModule] - Checking communication thread: true, false
2020-09-02 23:08:30.301 [TRACE] [.satel.internal.protocol.SatelModule] - Command enqueued: Message: command = 7E, payload = 

Could somone hint how to make the connection successfull or what shall I check else?

I have managed to find the issue :grinning: The firmware in INT-RS was not upgraded correctly to verison 1.14 (as required in binding) while I was trying to do it via Integra 64 central.
In order to upgrade it you need to connect computer with a new firmware directly to INT-RS module via its DB9 socet!