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RS-485 INTERFACE
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Chapter
9
List of subfunction codes
* Code 03, 05 to 09, and 16 are not supported by the F701-P.
* 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
byte
s
0x00, 0x00
Data
N×2
byte
s
Desired 16-bit data
[Response]
Echo of request
[Request]
Function
1
byte
0x08
Subfunction
2
byte
s
0x00, 0x01
Data
2
byte
s
Summary of Contents for F701-P
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