50
7 OPTION
50
OPTION
Chapter
7
List of subfunction codes
* Code 03, 05 to 09, and 16 are not supported by the F331.
* Code 04 brings about receive-only mode, while additions to each counter and event log (always
0x04 when in code 04) are executed.
00 (0x0000) Return query data
Request frame is returned as it is.
01 (0x0001) Restart communication option
Communication port is initialized. Communication event counter is also cleared.
Response is made before initialization.
In Listen-only mode, processing is also performed but no response is returned.
* If the data is 0xFF, 0x00, the event log is also cleared.
If 0x00, 0x00, the event log is kept.
Code Function name Command
00 (0x0000) Return query data Echo request
01 (0x0001) Restart communications option Initialize the communication port
02 (0x0002) Return diagnostic register Echo request
03 (0x0003) Change ASCII input delimiter
－
04 (0x0004) Force listen only mode Receive-only mode
05 - 09 Unused
10 (0x000A) Clear counters and diagnostic register Clear the counters and register
11 (0x000B) Return bus message count Read the message count
12 (0x000C) Return bus communication error count Read the CRC error count
13 (0x000D) Return bus exception error count Read the exception error count
14 (0x000E) Return slave message count Read the slave receiving count
15 (0x000F) Return slave No response count Read the no response count
16 (0x0010) Return slave NAK count
－
17 (0x0011) Return slave busy count Read the busy count
18 (0x0012) Return bus character overrun count Read the character overrun error count
20 (0x0014) Clear overrun counter and flag Clear the character overrun error counter
[Request]
Function 1 byte 0x08
Subfunction 2 bytes 0x00, 0x00
Data N×2
bytes Desired 16-bit data
[Response]
Echo of request
[Request]
Function 1 byte 0x08
Subfunction 2
bytes 0x00, 0x01
Data 2
bytes
[Response]
Echo of request
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