8 Using the Data Record Interface
161
IE/AS−INTERFACE LINK PN IO as of hardware version 1, as of firmware version V2.0
Release 08/2018
C79000−G8976−C216−03
8.2.2.10 Read_Diagnostic_String
Meaning
With AS-i slaves with profile 7.4, this call can be used to read a diagnostic string
from the AS-i slave with the specified AS-i slave address. The AS-i master returns
up to 220 bytes of response data. The number of diagnostic bytes actually sent by
the AS-i slave is signaled by the AS-i master in byte 2 (number of diagnostic
bytes).
If the AS-i slave sends a string longer than 220 bytes, the AS-i master aborts the
string transfer and terminates the job with an error. The received data are then not
made available to the user program.
As long as the string transfer is active, there is no user/analog data exchange with
the addressed AS-i slave.
Structure of the RecordDataRead service − Index 29
Byte Meaning
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0 Version_hi = 0x00
1 Version_lo = 0x00
2
Number of string bytes
3 String byte 1
4 String byte 2
... ...
221 String byte 219 (may be irrelevant)
222 String byte 220 (may be irrelevant)
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