Allen-Bradley PanelView 800 2711R-T10T, Руководство пользователя, Страница: 73 / 158

Rockwell Automation Publication 2711R-UM001E-EN-E - January 2017 73
Cable Connections and Communication Chapter 4
Security Considerations
IGMP (Internet Group Management Protocol) is used for IPv4 multicast. A
multicast is communication between a single sender and multiple receivers on a
network. IGMP is used to exchange membership status data between IPv4
routers that support multicasting and members of multicast groups. A router is
an intermediary device on a communication network that expedites message
delivery by finding the most efficient route for a message packet within a
network, or by routing packets from one sub-network to another. A sub-network
is a separate part of an organization’s network identified through IP addressing.
PanelView 800 terminals provide level 2 (full) support for IPv4 multicasting
(IGMP version 2) as described in RFC 1112 and RFC 2236.
SNMP (Simple Network Management Protocol) is used for internal network
management and is not supported.
Ports 137 and 138 are normally open to support the NetBIOS protocol used by
Windows CE.NET similar to other Microsoft and IBM network operating
systems.
Serial Connections The terminals have a multi-purpose serial RS-232 port that supports:
• DH-485 communication through a serial connection.
• DF1 full-duplex communication with controllers using direct connections
or modem connections.
• third-party point-to-point communication.
The serial port on the terminal is a 9-pin, male, RS-232 connector. An example
with the 1761-CBL-PM02 cable is shown here: