ScreenMaster RVG200
Paperless recorder
7 Configuration
OI/RVG200-EN
121
7.10.6 MODBUS TCP
MODBUS TCP enables MODBUS TCP devices to communicate via an ethernet network transferring
MODBUS messages via TCP / IP. Communication with standard, serially connected, MODBUS RTU
devices is also possible through a MODBUS TCP Gateway.
The recorder can be configured to act as either a MODBUS TCP Slave or a MODBUS TCP Master device
on a MODBUS TCP network.
If configured as a Slave, the recorder responds to MODBUS queries transferred via the MODBUS TCP
protocol for the registers described in Appendix B, page 149. The recorder can be configured for
unrestricted access or access can be restricted to a maximum of 6 MODBUS TCP Masters, from defined IP
addresses.
If configured as a Master, the recorder collects data from MODBUS TCP Slaves into its 24 Comms Analog
and 24 Comms Digital Channels. Each analog and digital input can be configured individually to any register
within any slave device. The configuration allows for receipt of data in most commonly used data formats
MODBUS TCP
Implementation
Select the required MODBUS TCP configuration.
Slave
Master
Disabled
–
–
–
recorder acts as a MODBUS Slave.
recorder acts as a MODBUS Master.
MODBUS TCP disabled.
Note.
The following parameters are displayed only if
Implementation
is set to
Slave
or
Master
.
MODBUS TCP Port
Set the TCP / IP port-through used by the MODBUS TCP network –
normally port 502.
Note.
The following parameter is displayed only if
Implementation
is set to
Slave
.
Reverse IEEE Data
All analog data is read from the recorder in IEEE format contained in
adjacent registers representing the data in high word, low word order.
Select
Yes
to reverse the IEEE data, otherwise select
No
.