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8. Modbus protocol
8. 10. Read Device Identification (43 = 16#2B)
Request:
Response:
The total response size given in this example equals 55 bytes.
The response contains the following four objects:
Slave no. 2B
Type of MEI
0E
ReadDeviceId
01
Object Id
00
CRC16
Lo Hi
1 byte 1 byte 1 byte 1 byte 1 byte 2 bytes
Slave no. 2B
Type of MEI
0E
ReadDeviceId
01
Degree of conformity
02
-------
1 byte 1 byte 1 byte 1 byte 1 byte
------- Number of additional frames
00
Next object Id
00
Number of objects
04
-------
1byte 1byte 1byte
------- Id of object no. 1
00+
Length of object no. 1
0D
Value of object no. 1
“Telemecanique”
-------
1 byte 1 byte 13 bytes
------- Id of object no. 2
01
Length of object no. 2
0B
Value of object no. 2
“ATV71HU15M3”
-------
1 byte 1 byte 11 bytes
------- Id of object no. 3
02
Length of object no. 3
04
Value of object no. 3
“0201”
-------
1byte 1byte 04bytes
------- Id of object no. 4
06
Length of object no. 4
09
Value of object no. 4
“MACHINE 4”
-------
1byte 1byte 09bytes
------- CRC16
Lo Hi
1byte 1byte
• Object no. 1: Manufacturer name (always "Telemecanique", i.e., 13 bytes).
• Object no. 2: Device catalog number (ASCII string; for example: “ATV71HU15M3”, i.e., 11 bytes).
The length of this object varies according to drive type. Use the “Length of object no. 2” field to determine the length.
• Object no. 3: Device version, in "MMmm" format where "MM" represents the determinant and "mm" the subdeterminant (4-byte
ASCII string; for example: "0201" for version 2.1).
• Object no. 4: Device name (ASCII string; for example: "MACHINE 4", i.e., 9 bytes).
The length of this object varies according to the device name assigned to the drive (the latter being configured by
the user): [7. DISPLAY CONFIG.] menu, [7.1 USER PARAMETERS] submenu, [DEVICE NAME] parameter.
This menu can only be accessed in Expert mode.
Maximum size 16 bytes.