Emerson EV3200 - Page 58

54 Appendix 2 Modbus Communication Protocol
EV3200 Door Control Inverter User Manual
If the operation fails, error code and exception code forming the protocol data unit will be replied. The error code is (Parameter
+ 0x80). The exception code denotes cause of the error; see the table below.
Exception code Meaning
0x03 Data error, exceeding upper or lower limit
0x18 Information frame error, including data length or check sum error
0x20 Parameter cannot be modified
0x21 Parameter cannot be modified during operation
0x22 Parameter protected by password
Example:
Request frame: read two function parameters, F0.01 as the initial address.
Address Function parameter Register address Quantity of inputs Check sum
0x01 0x03 0x00 0x01 0x00 0x02 0x95 0xCB
Response frame: read two function parameters, from high to low, that is, from F0.02 to F0.01
Content of inputs
Address Function parameter Bytes
F0.02 F0.01
Check sum
0x01 0x03 0x04 0x00 0x03 0x00 0x01 0x0A 0x33
Request frame: read 3305 DC bus voltage status parameter
Address Function parameter Register address Quantity of inputs Check sum
0x01 0x03 0x33 0x05 0x00 0x01 0x9B 0x4F
Response frame:
Address Function parameter Bytes Content of inputs Check sum
0x01 0x03 0x02 0x01 0x47 0XF9 0xE6
Protocol data unit format of modifying single inverter’s parameters:
Request format:
Protocol data unit Data length (bytes) Range
Function parameter 1 0x06
Register address 2 0x0000 ~ 0xFFFF
Register content 2 0x0000 ~ 0xFFFF
Response format:
Protocol data unit Data length (bytes) Range
Function parameter 1 0x06
Register address 2 0x0000 ~ 0xFFFF
Register content 2 0x0000 ~ 0xFFFF
For modifying single inverter’s parameters, the request frame is the same as the response frame: If the operation fails, error
code and exception code forming the protocol data unit will be replied. The error code is (Parameter + 0x80). For the error
code, refer to the above description.
Example:
Request frame: change F0.02 setting to 3.
Address Function parameter Register address Register content Check sum
0x05 0x06 0x00 0x02 0x00 0x03 0x69 0x8F
Response frame: setting change success, return to original value
Address Function parameter Register address Register content Check sum
0x01 0x06 0x00 0x02 0x00 0x03 0x69 0x8F
Parameter 0x41 is to modify single inverter’ parameter or control parameter and save it in a non-volatile memory. The format
is similar to that of 0x06. The only difference is that 0x41 parameter is saved upon power failure, while 0x06 not.
Protocol data unit format of modifying several inverter’s parameters: