The "cascade connection" refers to the RS485 port of the device connected to our RS485 IO devices, which
originally used Modbus RTU for communication. After cascading, the host computer can read the data of these
cascaded RS485 IO devices through Modbus TCP. Up to 16 RS485 IO devices can be cascaded. When the host
computer uses Modbus TCP to read the data of cascaded devices, to distinguish different 485 devices, it is
necessary to map the 485 address of the device to the unit ID in Modbus TCP protocol. For example, the host
computer reads the data of RS485 IO device with 485 address of 2, and the unit ID in the Modbus TCP data
message sent by the host computer needs to be set to 2.
Click
Add
to add the cascading device in the pop-up.
After setting the IP address of the device and the computer on the same network segment, click
Refresh
in the
lower-left corner of the software to see the device point value information, as shown below:
DI Value:
Short DI and GND, value is 1; otherwise, the value is 0
DO Status:
0, COM and NO are open; 1, COM and NO are Close
DI Positive/Negative pulse count:
Number of pulse changes, readable and writable. When
DI Automatic
zeroing
is set to "Automatic", the pulse count will be clear automatically after each reading. When
DI Automatic
zeroing
is set to "Manual", the pulse count will not be clear after each reading (the maximum value is 65535 and
then reset to zero), which needs to be manually cleared (manually write value 0 to clear).
C2000-A1-SDD1010-AB3 User Manual
19 / 34
SinoCon Co., Ltd.
www.sinoconsys.com
