Description of Controls
057-233 ISSUE: 1 Page 54 of 90
Module RS232 Port Configured For Connection to A Modbus Master
The modules operate as a modbus RTU slave device. In a modbus system, there is 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 RS232 port, ensure that ‘port usage’
is correctly set using the DSE Configuration
Suite Software.
‘Master inactivity timeout’ must 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
must be set to at least 2 seconds
The DSE MODBUS document containing register mappings inside the DSE module is available upon
request from support@deepseaplc.com. Email the request along with the serial number of the DSE
module to ensure the correct information is sent.
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