Generator, Reader, Inserter AV-TC 300 - Alpermann + Velte

User Manual AV-TC 300
Page 39
C3 Communication Protocol
This chapter describes the communication between the AV-TC 300 and any
computer and controlling device. In general the controlling device transmits
messages first and receives a response in return of AV-TC 300.
Another command may be sent, if the response to previous command has been
received. Some commands require a back-up. For that the response may last up
to 200ms.
A sent data string must be coherent, i.e. no time gap >about 100 times of bit’s
length (depends on the baud rate) resp. >10ms with baud rates >= 9600 baud is
allowed.
The received or sent data string looks as follows:
Byte 1 Byte 2 Byte 3 Byte 4 Byte n+2 Byte n+3 Byte n+4
Sony CMD1/DC CMD2 Data1 Data2 ... Data n Check
Sony+ID CMD1/DC CMD2 ID Data1 ... Data n-1 Data n Check
CMD 1
Data Count
CMD 2
Data 1 ...
Check
ID
First command, specifies the command group.
Number of data bytes, $0-$F.
Second command, specifies the command group.
Data bytes, as many bytes as defined in DC.
Hexadecimal sum of bytes 1 to (n+2) without carryover.
The protocol Sony+ID broadens the standard protocol
with one byte, which contain the device address.
CMD 1 Function Shorthand Direction
0 general control c controller AV-TC 300
2 general control return controller AV-TC 300
4 preset and select w controller AV-TC 300
6 request r controller AV-TC 300
7 request returns controller AV-TC 300
r = read, w = write, c = control (see chapter M4.5)