SIMREX MAN.ESS-01, Rev. F
DataMover ESS User’s Guide
63
SIMREX Corporation
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 member-
ship reports and IGMP queries, and responds to membership queries. It
defaults to V2 membership reports, but responds to both V1 and V2 que-
ries.
You must configure the multicasted serial port as the target for the mul-
ticast data (for example, multipoint-to-multipoint mode, or
point-to-multipoint mode where the inbound data is multicast). This
restriction is because a host that only sends data to a multicast address
(for example, point-to-multipoint mode where the ESS acts as a point)
will not join the group to receive multicast data because the host’s
inbound data is directed unicast data.
The serial-to-serial example which follows shows how to provide mul-
ticast services. (
See
“Point-to-Multipoint Serial-to-Serial Application
Example”
on Page 74
.)
PPP
External devices can connect to the transceiver using PPP
(Point-to-Point Protocol). The transceiver works as a server and assigns
an IP address to the device that connects through this interface.
To gain access to the transceiver from a PC even if the network is down,
a modem may be connected to one of the transceiver’s COM ports that
has been configured with PPP.
Data Buffering
Data buffering is always active regardless of the selected mode. When
Seamless mode is selected, a buffer size of 256 bytes is used. When
custom mode is selected, the size options are: 16. 32, 64, 128, and 256
bytes. The Inter-Frame Delay is settable in either Seamless or Custom
modes.
Implementing Configuration Changes
There are several configuration parameters for the Serial Gateway found
under the
Serial Configuration Menu
of the Management System. After
making changes to the configuration, you must use the menu’s “Commit
Changes” to assert the changes.
If you are connecting EIA-232 serial devices to the transceiver, review
these parameters carefully.
Serial Configuration Wizard
The Serial Configuration Wizard available through the
Serial Gateway
Configuration Menu
is recommended for configuration of serial ports. The
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