Lantronix CoBox-Micro, Руководство пользователя

Страница: 8 / 110

Embedded Device Servers Introduction
1-2
Embedded Device Servers
The CoBox-Mini, CoBox-Mini100, CoBox-Micro, and UDS-10B embedded Device
Servers connect serial devices to Ethernet networks using the IP protocol family (TCP for
connection-oriented stream applications and UDP for datagram applications). The main
benefit of these smaller, board-level Device Servers is that they can be embedded inside the
serial device for which they are providing network connectivity. A few of the different
types of serial devices supported are listed below:
! Time/Attendance Clocks and Terminals
! ATM Machines
!
CNC Controllers
! Data Collection Devices
! Universal Power Supply (UPS) Management Units
!
Telecommunications Equipment
! Data Display Devices
! Security Alarms and Access Control Devices
!
Handheld Instruments
Device Servers connect these devices through a TCP data channel or through a Telnet
connection to computers or other Device Servers. Datagrams can be sent by UDP.
Network Protocols
Device Servers use IP protocol for network communications. The supported protocols are
ARP, UDP, TCP, ICMP, Telnet, TFTP, DHCP, HTTP, SNMP, and BOOTP. For
connections to the serial port, TCP, UDP or Telnet protocols are used. Firmware updates
can be performed using TFTP.
The Internet Protocol (IP) defines addressing, routing, and data block handling over the
network. The Transmission Control Protocol (TCP) assures that no data is lost or
duplicated, and that everything sent to the connection arrives correctly at the target.
For typical datagram applications in which devices interact with other devices without
maintaining a point-to-point connection, User Datagram Protocol (UDP) is used.