Problem with modbus serial binding FATEK PLC

[Rambus stolica]

HI,

I think problem is simple and lies in lack of my knowledge ;)
My set:
Win7 Pro + USB/RS232 converter + Fatek PLC with Modbus RTU RS232 port (Same set is working fine with Promotic Scada software)

addons:
org.openhab.binding.modbus-1.6.1.jar
org.openhab.binding.serial-1.6.1.jar

openhab.cfg:
modbus:poll=2000
modbus:serial.slave1.connection=COM4:9600
modbus:serial.slave1.id=1
modbus:serial.slave1.length=7
modbus:serial.slave1.type=coil

demo.items:
Group All
Group gGF         (All)
Group GF_Kitchen     "Kitchen"         <kitchen>     (gGF)
Switch sw1 "sw1" (GF_Kitchen, Lights {modbus="slave1:7"}

default.sitemap:
sitemap demo label="Main Menu"
{
    Frame {
        Group item=gGF label="Ground Floor" icon="groundfloor"
        }
    }
}

starting openhab:
2014-12-07 02:40:21.675 [INFO ] [.service.AbstractActiveService] - Modbus Polling Service has been started
Last request: 01 01 00 00 00 04 3d c9
Error reading response
execute try 1 error: I/O exception - failed to read
Last request: 01 01 00 00 00 04 3d c9
Error reading response
execute try 2 error: I/O exception - failed to read
Last request: 01 01 00 00 00 04 3d c9
Error reading response
2014-12-07 02:40:23.453 [INFO ] [.b.modbus.internal.ModbusSlave] - ModbusSlave error getting responce from slave

from openhab.log:
2014-12-07 02:40:16.167 [INFO ] [.o.u.w.i.servlet.WebAppServlet] - Started Classic UI at /openhab.app
2014-12-07 02:40:21.675 [INFO ] [.service.AbstractActiveService] - Modbus Polling Service has been started
2014-12-07 02:40:23.453 [INFO ] [.b.modbus.internal.ModbusSlave] - ModbusSlave error getting responce from slave
2014-12-07 02:40:27.744 [INFO ] [.b.modbus.internal.ModbusSlave] - ModbusSlave error getting responce from slave
2014-12-07 02:40:32.051 [INFO ] [.b.modbus.internal.ModbusSlave] - ModbusSlave error getting responce from slave


Any one could  give me some hint what should i check? Maybe something is wrong at PLC side?

PLC Station number = 1
RS232 config:
Baud Rate: 9600
Parity: None
Data bit: 8
Stop Bit: 1
Reply delay time: 3ms
Transmission Delay: 0x10ms
Receive Time-out interval time: 50x10ms
Protocol: ModBus RTU(Slave)


Any suggestions are welcome ;)

[Rambus stolica]

Solved.

I was changing parameters of wrong comport at PLC