Chapter 11 RS485 Communication
11-2-2
When reading the status of 16 consecutive coils from coil number 0001h, the order of the data
is as follows. Data 1 is byte data transmitted first.
If the read coil extends beyond the range of the defined coil number, coil data outside the range
is sent as "0".
If the command cannot be executed successfully, an exceptional response is returned. For
details, refer to "11.2.9 Exceptional Responses".
Reads coil numbers 0010h to 0058h can also be substituted by holding register reads register
number 1E01h to 1E05h. As an example, the bit-structure of the holding register 1E01h is
shown below. For details, refer to "18.1.1 List of Modbus Coil Numbers".
■ (Example) Bit-structure of holding register 1 E 01 h
(Holding register allocation status of coil number 0010h to 001Fh)
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