migra MPB CAN
Large Format Graphics Compatible LED Display with CANopen Interface
Page 33
microSYST Systemelectronic GmbH, Am Gewerbepark 11, 92670 Windischeschenbach
+49 9681 91960-0,
+49 9681 91960-10, [email protected], www.microsyst.de
3.8
Response Frames
A response frame is only transmitted if the corresponding bit (bit 0) was
set in the FC byte, and if the broadcast address (127) has not been
used as the destination address.
Example
display address = 1,
master device address = 0
Response frame from the display to the master:
STX
DA
SA
FC
Data-Unit
ETX
Start of text
Destination
address
Source
address
Frame
control
Error code
End of text
00000010
b
10000000
b
10000001
b
10000000
b
00000011
b
02
h
80
h
81
h
80
h
“0” - “5”
(30
h
-35
h
)
03
h
Error Codes and their Meanings:
Value (ASCII character)
Meaning
“0” (30
h
)
No error
“1” (31
h
)
Incorrect checksum
“2” (32
h
)
Reserved
“3” (33
h
)
Incorrect number of data bytes (LEN-H/L), invalid escape
sequence
“4” (34
h
)
Element (text, variable, graphic, character set or macro)
is missing, invalid parameter
“5” (35
h
)
Invalid flash
The queried information is returned instead of error code “0” for frames
which require a response (see also “Reading Out the Decimal Point
from the Display” and “Digital Inputs and Outputs”).
The error code in the response frame always relates to the last partition
frame.