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VIPA System SLIO
Info-Byte
Telegram-Info-Byte
Length
Offset
RetVal
User data
Acknowledgement
HB300 | CP | 040-1CA00 | en | 18-28
Host system
Byte
Function
0
Acknowledgement
with n = number of used bytes in the address area (IO-Size)
Bit 3...0
8h: Idle state - no data available
n
n
9h: Data are transferred with fragmentation
n
Ah: Data are transferred without fragmentation
Bit 7...4
Reserved for sending
00h:
The telegram does not contain any additional offset information.
04h:
The telegram contains additional offset data, which are located as word
after Length.
With this offset the position of the user data in the input area is defined.
Length of user data for serial communication in byte plus 2bytes for RetVal.
Length 2byte: only RetVal without user data.
If the Telegram-Info-Byte is 04h, an additional offset is entered. Otherwise there is no
Offset in the telegram.
0517h:
Length is not valid (Length = 0 or Length > 1024)
080Ah:
A free receive buffer is not available.
080Ch:
Character with error received
(character frame or parity error)
Here the received user data of the serial communication may be found.
After you have processed accordingly the data in your master system, you have to
acknowledge the receipt to the CP (also RetVal telegrams without user data). Only then
he can provide new received data.
Bit 3...0
Reserved for sending
Bit 7...4
8h: Acknowledgement: Idle state
Ah: Acknowledgement: Input area free for new data
Bh: Command: Execute a reset on the CP
Principal communication via back plane bus > Receiving data
Byte
8...n-1
t
0
Deployment
CP
Function
User data
47
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