Eaton RTK 725B range - Read Status - Function 03 - Request; Read Status - Function 03 - Response

INM 725B Rev 21
99
13.4.19 Read Status – Function 03 – Request
Register Address
This is used to address the “start” register to be read from the slave device
Number of Registers
This represents the number of registers to be read from the salve device this can be up to 125
register at once.
13.4.20 Read Status – Function 03 – Response
Byte Count
This represents the number of bytes sent
Data
The data read from the salve device needs to be a valid value to operate the input.
If Channel set to Normally Open
Value AND’d with register mask not equal to register mask – Input Normal
Value AND’d with register mask equal to register mask – Input Abnormal
If Channel set to Normally Closed
Value AND’d with register mask not equal to register mask – Input Abnormal
Value AND’d with register mask equal to register mask – Input Normal
Typical Request Message Format Example
To read 28 registers on slave with node 9 the user would use the following message format
RTU
ADDRESS FUNCTION REGISTER ADDRESS No. of REGISTERS ERROR CHECK
09 03 00 00 00 1C 45 4B
ASCII
: ADDRESS FUNCTION REGISTER
ADDRESS
No. of
Registers
ERROR
CHECK
CR LF
3A 30 39 30 33 30 30 30 30 30 30 31 43 44 38 0D 0A