Siemens RUGGEDCOM RSG2200 User's Guide Page 133

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RUGGEDCOM ROS
User Guide
Chapter 5
Setup and Configuration
Turnaround Delay 121
Section 5.4.2.3
Turnaround Delay
The Modbus protocol uses the concept of a turnaround delay in conjunction with broadcast messages. When the
host sends a broadcast message (that does not invoke an RTU response), it waits for a turnaround delay time.
This delay makes sure the RTU has enough time to process the broadcast message before it receives the next
poll.
When polling is performed over TCP, network delays may cause the broadcast and next poll to arrive at the
remote server at the same time. Configuring a turnaround delay at the server will enforce a minimum separation
time between each message transmitted via the serial port.
Note that turnaround delays do not need to be configured at the host computer side and may be disabled there.
Section 5.4.3
DNP, Microlok, TIN and WIN Concepts
The following sections describe some of the concepts related to Distributed Network Protocol (DNP), Microlok,
TIN and Wireless Intelligent Network (WIN) as they relate to the implementation of serial protocols in ROS:
Section 5.4.3.1, “DNP, Microlok, TIN and WIN Applications”
Section 5.4.3.2, “The Concept of Links”
Section 5.4.3.3, “Address Learning for TIN”
Section 5.4.3.4, “Address Learning for DNP”
Section 5.4.3.5, “Broadcast Messages”
Section 5.4.3.6, “Transport Protocols”
Section 5.4.3.1
DNP, Microlok, TIN and WIN Applications
RMC30 supports a variety of protocols that specify source and destination addresses. A destination address
specifies which device should process the data, and the source address specifies which device sent the
message. Having both destination and source addresses satisfies at least one requirement for peer-to-peer
communication because the receiver knows where to direct responses. Each device supporting one of these
protocols must have a unique address within the collection of devices sending and receiving messages to and
from each other.
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