TCP/IP

The TCP/IP page provides the settings for enabling the TCP/IP socket and configuring it to properly communicate with a Property Management System (PMS). The figure below shows the settings available on this page.

Setting	Description
Port ID	Enter the TCP port number to use. The default is 5000. Consult your PMS configuration for the exact port number that it is using.
Server name or IP address	This setting only matters if you are using the TCP Client connection type. Enter the DNS name or IP address of the PMS.
Enable ACK-NAK response	Check this box if the VMS is expected to respond to PMS packets with an ACK (and vice-versa). The Opera's FIAS protocol does not use ACK/NAK responses when the connection is over TCP/IP. Most other protocols, however, do. By default, this setting should be enabled unless the protocol is Micros Fidelio Opera.
Use ENQ-ACK handshake	Check this box if you need the VMS to send an ENQ (enquiry) and receive back an ACK (acknowledgment) before it is allowed to send a message packet to the PMS. Note: Some PMS protocols use the ENQ to request that the VMS resend its response to the last packet received. In such a case, this setting should be disabled. This setting should always be disabled if PMS type is Opera.

Notes on TCP Communication

In most cases, the DV2000/DV4 can act as either the server or as the client, depending on what the PMS requires. In server mode, the DV2000/DV4 opens the TCP port and listens for incoming connections; the PMS is expected to initiate the connection. If the PMS drops the connection, the VMS will just continue listening for the PMS to reconnect. The VMS will only close the connection if it needs to as a result of the idle timeout setting or if the system is shutting down.

In client mode, the VMS opens the TCP port and connects to the PMS. Once the connection is made, the VMS will maintain the connection for as long as the hospitality server is running and the idle timeout setting is not triggered. If the connection is closed by the PMS, the DV2000/DV4 will periodically attempt to reconnect.

While with most protocols the VMS can be either server or client, in the case of Jonas it must always be server. Likewise, in the case of Micros Fidelio Opera, it must be client. Finally, in the case of NEC NEAX 60, TCP is not supported at all; that protocol is only supported over a serial link.