W&T COM-Server Highspeed

The configuration of the COM-Server can be done with Telnet (Port 1111)

TCP Socket connections:

Name	port number TCP data connection	port number for Reset
Port A	8000	9084
Port B	8100	9184
Port C	8200	9284
Port D	8300	9384

Reset of the complete COM-server via port 8888
If a connection is opened on this port, the COM-Server closes the connection immediately and performs a Software Reset.
After the reset all buffers and all active connections are deleted.


menu tree

Subnet Mask (Default = 255.0.0.0)

The subnet mask only needs to be entered if the COM-Server will be making connections to another subnet. Enter the subnet mask of the subnet in which the Com-Server is located

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MTU - Maximum Transfer Unit (Default: 560)

This value determines the maximum size of a TCP/IP packet. It refers to the number of bytes (excluding header) that can be sent in a packet.

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DHCP Client (Default: 1 = ON)

The factory default setting is for DHCP protocol active. ( Recommendation: switch off )

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WBM Port (Default: 0000)

The value specifies the TCP port number under which the Web Based Management (WBM) of the COM-Server is accessible from a browser. The factory setting is 0000, which means WBM is deactivated.

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Keep Alive Time (sec) (Default: 0 = OFF)

If the keep-alive check is activated by entering and saving a value in second ticks, all TCP connections are monitored for network-side data traffic. If there is no network traffic within the set time, the Com-Server generates a keep-alive packet. If the partner does not answer this packet, the connection is reset in the Com-Server. This deletes any data still contained in the serial in- and output buffers

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Retransmission Timeouts (ms) (Default: 240)

This timeout determines what time must elapse before network packets are repeated if necessary. In most networks the default setting of 240ms can be used. Only when there are very long latency times between the ComServer and its respective communications partner would you need to increase this value.

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Network Delay [10ms-Ticks] Default: 0000)

This value specifies the minimum delay time of the ComServer after serial data have arrived. After this time has expired, it packs the data into a network packet and sends them to the respective communications partner. The default setting 0 means the attempt is made to send the data as quickly as possible. The resulting high time transparency does however bring with it the drawback of a higher number of network packets. If the serial transmission takes place in predictable block sizes, this value can be adjusted to optimize the network load. There is also the advantage that the serial blocks are transmitted within a network packets, so that they arrive at the receiver bundled.

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Flush Buffer Default: aktiv

If this switch is active, the serial buffer is cleared each time a new connection is opened; any residual data which cannot be transmitted (e.g. handshake stop of the serial terminal device) are thus lost. But if you connect a terminal device to the Com-Server which for example requires a longer handshake stop for program reasons, you can prevent clearing of the buffer by deactivating the switch. In this way multiple connections can be opened one after the other on the network side and the data are accumulated in the buffer until they are sent.

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Local Port (TCP/UDP)

with mode passive TCP-server
factory setup:

• Port A 8000 (all models with only one serial port)
• Port B 8100
• Port C 8200
• Port D 8300

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Software Reset

Socket 8888 has been implemented in case the Com-Server ever needs to be completely reset. If a connection is opened on this port, the Com-Server immediately closes it again and then performs a software reset

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