Shenzhen Nowforever Electronics Technology DK00 Series, Руководство пользователя

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MODBUS Communication Protocol
9.4.2 Monitoring Data
The function code of d0, d1, d2, d3 function groups can be
used as surveillance data, use the 03H function Code to read the
content. Each function code MODBUS register address see the
function list. Transfer data to an integer, pay attention to the unit of
each function code.
9.4.3 Set Data
The function code of P0 function group can be modified, use
the 10H function code is written. MODBUS register address of all
function codes see the function list. Transfer data to an integer, pay
attention to the unit of each function code.
9.4.4 Test Data
When Looping test, receive test data of 08H function code,
and respond reply.