Data; Response - ICP DAS USA WF-2000 Series User Manual

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The Modbus/TCP feature of WF-2000 series module supports 7
function codes, which allows the reading and writing of data contents of
registers.
Table 5-2: Supports Function Codes of WF-2000 series
Function Code
01 (0x01)
02 (0x02)
03 (0x03)
04 (0x04)
05 (0x05)
15 (0x0F)
16 (0x10)
Any other function code request will be returned with an error
response indicating the function code is not supported, as well as a
request for too much data or data at a register address that not present.

5.2.3 Data

The data field of Modbus request sent from a client to server devices
contains additional information that the server uses to take the action
defined by the function code. This can include items like discrete and
register addresses, the quantity of items to be handled, and the count of
actual data bytes in the field.
The data field may be nonexistent (of zero length) in certain kinds of
requests; in this case the server does not require any additional
information. The function code alone specifies the action.

5.2.4 Response

If no error occurs related to the Modbus function requested in a
properly received Modbus PDU (Protocol Data Unit) the data field of a
WF-2000 Series Wi-Fi I/O
Descriptions
Read Coil Status
Read Input Status
Read Holding Registers
Read Input Registers
Force Single Coil
Force Multiple Coils
Preset Multiple Registers
User's Manual (Ver. 1.0, Sep./2012) ------------- 47