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Modbus/BSAP Configuration
34 Raven CDMA User Guide for Verizon, version 2.23
motion control, process control, Distributed Control System and complex network-
ing.
Modbus TCP/IP
Modbus TCP/IP simply takes the Modbus instruction set and wraps TCP/IP around
it. Since TCP/IP is the communications standard for the Internet and most net
-
worked computers, this provides a simpler installation. Modbus TCP/IP uses stan-
dard Ethernet equipment.
Raven Modbus on UDP
When Ravens are used in place of radios, a Raven is connected to the central station
(host) and a Raven is connected to each remote unit. When the Raven is configured
for Modbus with UDP, the Raven connected to the host can store a list of IP
addresses or names with matching IDs. When the host at the central station sends
serial data as a poll request, the Raven at the host matches the RTU ID to a corre
-
sponding IP of a Raven at a remote unit. A UDP packet is assembled encapsulating
the RTU ID and serial data transmitted from the host. The UDP packet is then
transmited to the specific Raven at the remote unit matching the RTU ID. The
remote Raven then disassembles the packet before transmiting the RTU ID and
serial data to the remote unit. The remote units operate in normal UDP mode and
their data is sent to the host via the remote Raven and host Raven.
FIGURE 1. Automation and Telemetry