Toa DP-SP3 Protocol - Manual (Page 2)

Digital speaker processor DP-SP3
TOA Corporation 2/14
■ TCP/IP Connection
No. Parameter Description (rules)
1 Connection Path 1 path
2 Data Length Variable-length, The maximum length is 1024 bytes
3 Code Classification Binary
4 Delivery Confirm No handshakes at application layer
5 Resend Control None
6 Priority Control None
DP-SP3 is a TCP server.
TCP Port is always connected.
For the purpose of connection keeping, DP-SP3 performs the following behavior.
Transmitting some kind of data at least once in the last 10 seconds.
When there is the status that for send, DP-SP3 transmits the contents. When there is not it, DP-SP3
transmits 0xFF only as for 1 byte.
When DP-SP3 received nothing from a remote controller more than 1 minute, DP-SP3 disconnect
the TCP/IP connection.
■ Command Construction
Command Data length (N) Data 1 Data 2 ……… Data N
Where Command is in the range 80H to FFH. And where Data length and Data are in the range 00H
to 7FH.
The second byte data indicates the number of byte data that follow the second byte data.
If received data contains more byte data than the indicated number, those exceeding the number are
abandoned.
When a next command is received, the previous data is abandoned if shorter than the indicated
number.