Lenze E84DGFCA - Manual (Page 44)

Parameter data transfer
CTT2: Read parameter value
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Lenze · Decentralised frequency inverter 8400 motec (AS-Interface option) · EDS84DMOTASI EN 4.0 - 09/2013
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9.1 CTT2: Read parameter value
• Acyclic read request from the master to the slave:
• Response from slave to master is OK:
• Response from slave to master has failed:
Byte Contents / value
0 CTT2: Code
• Index 0x12 (18): Acyclic read request
1 CTT2: Index
• Index 0x10 (16): Read parameter value
2 CTT2: Number of bytes
• Value depends on the master.
Byte Contents / value
0 CTT2: Code
• Index 0x52 (82): Acyclic read request is OK.
1 Data type / number of bytes
Bit 7 = 0
Octet string (text)
• Bits 0 ... 6 = Number of string characters
Bit 7 = 1 Number (4 data bytes):
• Bits 0 ... 2 = Number of valid bytes
(1 = 1 byte, 2 = 2 bytes, 3 = 3 bytes, 4 = 4 bytes)
2 1st character of the character string or data byte 1 (MSB)
3 2nd character of the string or data byte 2
4 3rd character of the string or data byte 3
5 4th character of the string or data byte 4 (LSB)
6 5th character of the string
... ...
n n-th character of the string
Byte Contents / value
0 CTT2: Code
• Index 0x92 (146): Acyclic read request is not OK.
1 CTT2: Standard error code
 CTT2: Standard error codes ( 51)
2 Error code (MSB)
3 Error code
4 Error code
5 Error code (LSB)
 CTT2: Acyclic device error codes ( 52)