Modbus Configuration Details

1. Modbus Settings :- Modbus RTU is implemented in this module.

Parameter	Value	Note
Slave ID	Any 1 byte Integer Value	Slave id is mentioned on the case of DI8-O4 module. (default is 99)
Function Code	1,3,5,6,15	1 - To read input and output status. 3 - To read holding register. 5 - To write single output. 6 - To write holding register. 15- To write multiple output.
Offset	1	-

1. Register Addresses :-

Parameter	Address	Description
DI Status Bits	10001 - 10008	Read Digital Inputs status from X1 to X7 respectively.
DO Status Bits	20000 - 20003	Read / Write Digital Output Status from Y0 to Y3 respectively.
Slave ID	43001	To read current or to set new slave ID.
Reset Module	43002	Write 1 on this address to restart DI8-O4.

1. Modbus Read Request Example

Action	Slave ID	Function Code	Starting Address	Number of Registers/Coils
Read Input status	1	1	10001	8
Read Output Status	1	1	20000	4
Read Slave ID	1	3	43001	1

1. Modbus Write Request Example

Action	Slave ID	Function code	Starting Address	No. of Register/Coils	Value
Change State of Single Output	1	5	20000	1	0- LOW 1 - HIGH
Change State of Multiple Output	1	15	20000	4	0 - LOW 1 - HIGH
Change Slave ID	1	6	43001	1	Any Integer Value
Restart Module	1	6	43002	1	1