Schneider Electric VW3 A3 303 用户手册
29
8. 6. Diagnostics (8)
Request and response:
The counters are unsigned words.
Example: Values 16#31 and 16#32 echoed by slave 4
Request and response:
Slave no.
08
Sub-code
Data
CRC16
Hi
Lo
Hi
Lo
Hi
Lo
1 byte
1 byte
2 bytes
2 bytes
2 bytes
Sub
code
Function
Request
data
Response
data
00
Echo
This function asks the slave to return the request sent by the master. The size
of the data is limited to 2 bytes.
This function asks the slave to return the request sent by the master. The size
of the data is limited to 2 bytes.
XX YY
XX YY
01
Reinitialize channel
This function is used to reinitialize slave communication and, in particular, to
make it exit listen only mode (LOM).
This function is used to reinitialize slave communication and, in particular, to
make it exit listen only mode (LOM).
16#00 00
or
16#FF 00
16#00 00
or
16#FF 00
03
Change ASCII delimiter
In ASCII mode, messages are delimited by the line feed character
(LF = H'0A). This function is used to change this character.
In ASCII mode, messages are delimited by the line feed character
(LF = H'0A). This function is used to change this character.
XX 00
XX = new delimiter
XX 00
04
Change to LOM mode
This function is used to force a slave to listen only mode (LOM). In this mode,
the slave does not handle messages which are addressed to it, nor does it send
any responses, except when the channel is reinitialized.
This function is used to force a slave to listen only mode (LOM). In this mode,
the slave does not handle messages which are addressed to it, nor does it send
any responses, except when the channel is reinitialized.
00 00
00 00
0A
Counter reset
This function resets all the counters responsible for monitoring slave
exchanges.
This function resets all the counters responsible for monitoring slave
exchanges.
00 00
00 00
0B
Read the number of correct messages on the line without checksum error
00 00
Value of
counter
0C
Read the number of incorrect messages on the line with checksum error
00 00
Value of
counter
0D
Read the number of exception responses sent by the slave
00 00
Value of
counter
0E
Read the number of messages addressed to the slave excluding
broadcast messages regardless of type
broadcast messages regardless of type
00 00
Value of
counter
0F
Read the number of broadcast messages on the line regardless of type
00 00
Value of
counter
10
Read the number of NAK exception responses
The value read is always 0.
The value read is always 0.
00 00
00 00
11
Read the number of slave not ready responses
The value read is always 0.
The value read is always 0.
00 00
00 00
12
Read the number of messages received with character overrun
00 00
Value of
counter
Slave no.
Code
Subcode
Value of
1
st
byte
Value of
2
2
nd
byte
CRC
CRC
Hi
Lo
Lo
Hi
04
08
00
00
31
32
74
1B