Owner's manual

1 TRANSMITTER MODBUS CONFIGURATION
OVERVIEW
1.1 Introduction
Modbus is an application layer messaging protocol that provides
client/server communication between devices connected on different
types of buses or networks.
Modbus has been industry’s serial de facto standard since 1979 and
enables millions of automation devices to communicate. Support for
the simple and elegant structure of Modbus continues to grow.
Modbus is a request/reply protocol and offers services specified by
function codes. Modbus function codes are elements of Modbus
request/reply messages.
This document describes the Modbus configuration options available
in the Passive sonar transmitter.
1.1.1 Passive Sonar Transmitters That Support MODBUS
The following transmitter model numbers will support Modbus
protocol:
• TB8-XX-XX-1X-XX where x can be any alpha-numeric
character. The ‘1’ indicates the transmitter firmware supports
Modbus communications.
1.1.2 Modbus Variants Supported by Transmitter
The passive sonar transmitter supports the following Modbus variants:
Media
• Asynchronous serial transmission over RS-232 or RS-485
Transmission Modes
• RTU
• ASCII
Serial Settings
• 7 / 8 Data Bits
• EVEN / ODD / NO Parity
• 1 / 2 Stop Bits
• 2400 / 9600 / 19200 / 38400 / 57600 / 115200 Baud
Other Modbus Options
• Device Address (001 – 247)
• ASCII Timeout (1 – 99 Seconds)
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