I can't connect the MT880 CM-LTE-3 modem meter to Gurux in DLMS.

Hi,
I connected the CM-LTE-3 modem to the PC through RS485-USB converter. I set Gurux with the parameters:
-Iskraemeco
-HDLC
-Authentication none
-Client Address 46 (30+16)
-Logical Name Referecing on
-Physical Server 11
-Logical Server 1
-Serial COM4 9600 8N1
-DLMS standards
But the MT880 doesn't answer me. "Failed to receive reply from the device in given time".

The logs:
GXDLMSDirector 9.0.2504.0301
Log created 15:57:07
15:57:13 Initializing serial connection.
15:57:14 Send SNRM request.
7E A0 08 02 17 5D 93 16 D8 7E
15:57:19 Data send failed. Try to resend 1/3
15:57:24 Data send failed. Try to resend 2/3
15:57:29 Failed to receive reply from the device in given time.
15:57:29 Disconnect request
15:57:29 Send Disconnect request.
7E A0 08 02 17 5D 53 1A 1E 7E
15:57:34 Data send failed. Try to resend 1/3
15:57:39 Data send failed. Try to resend 2/3
15:57:44 Failed to receive reply from the device in given time.
System.TimeoutException: Failed to receive reply from the device in given time.
in GXDLMSDirector.GXDLMSCommunicator.ReadDLMSPacket(Byte[] data, Int32 tryCount, GXReplyData reply)
in GXDLMSDirector.GXDLMSCommunicator.ReadDataBlock(Byte[] data, String text, Int32 multiplier, Int32 tryCount, GXReplyData reply)
in GXDLMSDirector.GXDLMSCommunicator.InitializeConnection(Boolean force)
in GXDLMSDirector.GXDLMSDevice.InitializeConnection()
in GXDLMSDirector.MainForm.Connect(Object sender, GXAsyncWork work, Object[] parameters)

If anyone can help me, thank you!