95
12
Interface
95
Interface
Chapter
12
12 (0x0C) Get Comm Event Log
This function is used for reading the event status from slave devices.
The contents of the status and the event counter are the same as status 11 (Get Comm Event
Counter). Message count is the same as sub-function 11 (Return Bus Message Count) of status 08.
The event log retains 64 bytes worth of messages communicated by the slave device.
The newest event is always the 0th byte, and old events are discarded when it exceeds 64. The
detailed contents of the events will be defined later on.
*: N = Number of (3 x 2)
e.g.) The event status is read.
The example shows 264 times for the event counter (0x0108), 289 times for the message
counter (0x0121), and not busy (0x0000). The newest event is 11000000 (0xC0) and bit 6 is 1,
which means that the broadcast was received. The previous event is 00, indicating that the slave
device received a request for Communications Restart.
[Request]
Function
1 byte
0x0C
[Response]
Function
1 byte
0x0C
Byte count
1 byte
N *
Status
2 byte
0x0000
Event counter
2 byte
0x0000 to 0xFFFF
Message count
2 byte
0x0000 to 0xFFFF
Event counter
N byte
0 to 64 (number of events)
[Error response]
Error code
1 byte
0x8C (fu0x80)
Exception code
1 byte
01
[Request]
Function
0C
[Response]
Function
0C
Byte count
08
Status (HI)
00
Status (LO)
00
Event counter (HI)
01
Event counter (LO)
08
Message count (HI)
01
Message count (LO)
21
Event 0
C0
Event 1
00
