Typical Applications; Operating Parameters - GE MDS SD Series Reference Manual

Application Protocol
Single Port Serial Modbus RTU
Polling without
encryption (COM2
or COM1)
Single Port Serial Modbus RTU
Polling with
encryption (COM2
or COM1)
Polled Multiple Ports DNP3 and
(any combination of Modbus RTU
COM1, COM2, and
IP Payload)
Polled IP Payload Modbus RTU via
UDP
Polled Bridged Modbus TCP
Ethernet
MDS 05-4846A01, Rev. C

3.0 TYPICAL APPLICATIONS

This section describes some common scenarios in which the transceiver
may be employed. A number of variations are possible, and if you have
unique requirements not covered here, it is recommended that you con-
sult a support specialist at GE MDS. Contact information is provided at
the back of this manual.

3.1 Operating Parameters

The transceiver is intended for use in poll-response networks where a
central Master unit communicates with a number of Remote radios one
at a time. The Master exchanges data with the currently-connected
Remote, and when finished, it establishes a new connection with the
next Remote in the polling order. Some networks operate with a variant
of this scheme called report-by-exception, whereby a Remote only
transmits if it has traffic to send, typically prompted by a change in
status conditions from the Remote data equipment.
The radio's menu system includes a number of parameters which may
be set to suit the requirements of a particular application. Table 2 pro-
vides a summary of common applications, protocols, radio modes used,
and the required settings for three key parameters: AES (encryption),
CSMA (collision avoidance/Listen Before Transmit), and Multihost set-
tings. Refer to the table to determine what applications can be supported
and what the required radio settings are.
Table 2. Application Types vs. Key Radio Settings
Radio
Mode
Transparent
Packet
Packet
Packet
Packet
SD Series Ref. Manual (Packet & Transparent Mode)
AES CSMA (LBT)
OFF OFF
ON OFF
ON or OFF OFF
ON or OFF OFF
ON or OFF Listen on RX
Multihost Notes
OFF
OFF
Optional OFF if polling is
(see note) synchronized; On
otherwise
OFF
OFF
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