Yokogawa Removable Chassis DX1000N - Manual (Page 63)

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IM 04L41B01-17E
Using the Ethernet Interface
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App
Index
Port Number
The default value is 502. To change the setting,
◊ Press
MENU (to switch to setting mode), hold down FUNC for 3 s (to switch to basic
setting mode), and select the Environment tab > Communication > Service port.
For the selectable range of port numbers, see section 6.1.
Reading/Writing the DX Data on Another Device
Another device (client device) sends commands to the DX to read the DX data or write
data to the DX. You can perform some operations, such as memory start, by writing in
the registers.
For the function codes that the DX supports and the DX registers that the client device
can access, see “Modbus Server Function” in section 6.3.
Specifying the Register Number
Specify the DX register on the client device according to the instructions below.
• If you are using a commercial SCADA system or something similar, specify the
register number (a number such as 400001; referred to as the “reference number”)
listed under Modbus Server Function in section 6.3, “Modbus Protocol Specifications.”
• If you are using a custom communication program, specify the “relative number”
in relation to the reference number. Compute the relative number in the manner
indicated in the examples below.
Examples
The relative number for input register 300100 is 99, which is the difference between
300100 and 300001.
300100 – 300001 = 99
The relative number for input register 400011 is 10, which is the difference between
400011 and 400001.
400011 – 400001 = 10
1.9 Using the Modbus Server Function