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8. Modbus protocol
Negative response specifically related to the identification function:
Example of positive response:
• Address = 2
• Manufacturer name = “Telemecanique”
• Device name = “ATV71HU15M3”
• Device version = “0201”
• Device name = “MACHINE 4”
Request:
Response:
Slave no. 2B + 80
AB
Type of MEI
0E
Error code
00 to 02
CRC16
Lo Hi
1 byte 1 byte 1 byte 1 byte 1 byte 1 byte
Error code: 16#00 = No error
16#01 = The "Request code" (16#2B), the "Type of MEI" (16#0E) or the "ReadDeviceId" (16#01) contained in the
request is incorrect.
16#02 = The "Object Id" (16#00) contained in the request is incorrect.
Slave no. Request code Type of MEI ReadDeviceld Object Id
CRC
Lo
CRC
Hi
02 2B 0E 01 00 34 77
Slave no. Response
code
Type of
MEI
ReadDeviceld
Degree of
conformity
No. of additional
frames
Next object Id
Object no.
-------
-------
02 2B 0E 01 02 00 00 04
----- Id of
object no.
1
Length of
object no. 1
Value of object no. 1
-----
----- ’T’ ’e’ ’l’ ’e’ ’m’ ’e’ ’c’ ’a’ ’n’ ’i’ ’q’ ’u’ ’e’
-----
00 0D 54 65 6C 65 6D 65 63 61 6E 69 71 75 65
---- Id of
object no.
2
Length of
object no. 2
Value of object no. 2
----
---- ’A’ ’T’ ’V’ ’7’ ’1’ ’H’ ’U’ ’1’ ’5’ ’M’ ’3’
----
01 0B 41 54 56 37 31 48 55 31 35 4D 33
---- Id of
object no.
Length of
object no. 3
Value of object no. 3
---- ’0’ ’2’ ’0’ ’1’
02 04 30 32 30 31
---- Id of
object no.
4
Length of
object no. 4
Value of object no. 4 CRC CRC
---- ’M’ ’A’ ’C’ ’H’ ’I’ ’N’ ’E’ ’ ’ ’4’ Lo Hi
06 09 4D 41 43 48 49 4E 45 20 34 6F 50