Oldham MX 32 - Address Table

12 – RS485 Digital Output
57
- Slave number for the unit (defined by COM 32) 02 = 0x02
- Operating type (03 = read) 03 = 0x03
- Address of the 1
st
word 2000+64 = 0x0810
- Number of words to read 01 = 0x0001
- CRC
Thread: 0x02 0x03 0x08 0x10 0x00 0x01 0xCRC 0xCRC
Example
Access the status of the sensor located at analog input 1 of unit n° 2.
A. Calculation of the table index: 256 + 1 = 257
B. Request script:
- Slave number for the unit (defined by COM 32) 02 = 0x02
- Operating type (03 = read) 03 = 0x03
- Address of the 1
st
word 2300 + 57 = 0x09FD
- Number of words to read 01 = 0x0001
- CRC
Thread: 0x01 0x03 0x09 0xFD 0x00 0x01 0xCRC 0xCRC
Address Table
Supervision of the MX 32 sensors
All reading requests for the Modbus are done via function 3. The cartography
is shown below:
0
Slave address
management
From addresses 0 to 1999, the Modbus
request address serves to select a
slave.
The response consists of a data
structure corresponding to the slave
configuration outlined below.
2000
65535
Standard address
management.
From addresses 2000 to 65535 the
address management is typical Modbus
address management.