GE MDS Mercury 3650, Справочное руководство

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05-4446A01, Rev. E Mercury Reference Manual 77
received, or a number of bytes that exceed the buffer size. Both of these
triggers are user-configurable.
One radio can perform serial data encapsulation (IP-to-Serial) and talk
to a PC. You can use two radios together (or one radio and a terminal
server) to provide a serial-to-serial channel. For more information,
see
“IP-to-Serial Application Example” on Page 83 and Point-to-Point
Serial-to-Serial Application Example on Page 83 .
TCP Client vs. TCP
Server
On a TCP session there is a server side and a client side. You can con-
figure the transceiver to act as either a server or a client. The server
always waits for requests from clients.
The client mode attempts to establish a connection to a server (typically
running on a PC) whenever it receives data on the serial port. There is
also a Client/Server mode, where the client establishes a connection
when data is received on the serial port and the server is not currently
handling a connection.
UDP Multicast
IP provides a mechanism to perform a limited broadcast to a specific
group of devices. This is known as multicast addressing. Multicast
addressing requires the use of a specific branch of IP addresses set apart
by the Internet Assigned Numbers Authority (IANA) for this purpose.
UDP multicast is generally used to transport polling protocols typically
used in SCADA applications where multiple remote devices will
receive and process the same poll message.
As part of the Multicast implementation, the radio sends IGMP mem-
bership reports and IGMP queries, and responds to membership queries.
It defaults to V2 membership reports, but responds to both V1 and V2
queries.
The Point-to-Multipoint Serial-to-Serial Application Example on
Page 84 shows how to provide multicast services.
Data Buffering
Data buffering is always active regardless of the selected mode. If you
connect EIA-232 serial devices to the transceiver, review these parame-
ters carefully.
Serial Configuration Wizard
GE MDS recommends the Serial Configuration Wizard, available
through the
Serial Port Configuration Menu , for configuration of the serial
terminal services. The wizard uses a step-by-step process, eliminates
possible conflicting settings, and streamlines complex configurations.
You can bypass the wizard by selecting option B) View Current Settings
and adjusting the individual settings of the appropriate parameter.