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GFK-1852 3-1
Network Protocols
The VMSE product uses TCP/IP protocols for network communication. The
supported standards are: ARP, UDP, TCP, ICMP, Telnet, TFTP, DHCP, and SNMP.
For transparent connections, TCP/IP (binary stream) or Telnet protocols are used.
Firmware upgrades can be made with the TFTP protocol.
The IP protocol defines addressing, routing and data block handling over the
network. The TCP (transmission control protocol) assures that no data is lost or
duplicated, and that everything sent into the connection on one side arrives at the
target exactly as it was sent.
For typical datagram applications where devices interact with others without
maintaining a point to point connection, a UDP datagram is used.
Packing Algorithm (PassThru Firmware only)
The two available packet algorithms (which define how and when packets are sent to
the network) are software selectable. The standard algorithm is optimized for
applications where VMSE is used in a local environment, allowing for very small
delays for single characters while trying to keep the packet count low. The alternate
packing algorithm minimizes the packet count on the network, and is especially
useful for applications in routed Wide Area Networks. Various parameters can be set
in this mode to economize the serial data stream.
IP Address
Every active device connected to the TCP/IP network must have a unique IP address.
This IP address is used to reference a specific device, for example, to build a
connection to the VMSE’s serial port. See Appendix A for a complete description of
IP Addressing.
Chapter
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