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5.4.7 RS485 SERIAL PORT
This section is included to give information about the currently selected serial port and external
modem (if connected).
The items displayed on this page will change depending upon configuration of the module. You are
referred to your system supplier for further details.
NOTE:- Factory Default settings are for the RS485 port to operating at 19200 baud,
modbus slave address 10.
Module RS485 port configured for connection to a modbus master.
The modules operate as a modbus RTU slave device.
In a modbus system, there can be only one Master, typically a PLC, HMI
system or PC SCADA system.
This master requests for information from the modbus slave (The module) and may (in control
systems) also send request to change operating modes etc. Unless the Master makes a request, the
slave is ‘quiet’ on the data link.
The factory settings are for the module to communicate at 19200 baud, modbus slave address 10.
To use the RS485 port, ensure that ‘port usage’ is correctly set using the DSE Configuration Suite
Software.
Required settings are shown below.
‘Master inactivity timeout’ should be set to at least twice the value of the system scan time. For
example if a modbus master PLC requests data from the module once per second, the timeout
should be set to at least 2 seconds.
The DSE Modbus Gencomm document containing register mappings inside the DSE module is
available upon request from support@deepseaplc.com. Email your request along with the serial
number of your DSE module to ensure the correct information is sent to you.
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