IHSE USA 474 Series Draco major - Manual (Page 152)

Draco major
152 2011-10-11
7.4 Serial Control
7.4.1 Telegram Structure
Command
<STX>, <command byte (CMD)>, [data bytes (D0…DN)], <ETX>
[ ] = Optional elements
Response
<ACK> , [<ECHO>]
[ ] = Optional elements
<ECHO> reports the matrix sequences solicited by a command and thus
the new switching status of the matrix. The echo can be used to update
user applications and to operate several matrices in parallel.
Parameter Description
Command byte: In the range 0x40 to 0x6F
(see list of allowed commands below)
Data bytes:
a) Binary data:
In order to prevent that, during the
transmission of binary data, control statements of
control commands are transferred, the data are
divided into low-nibble and high-nibble. The data
are distributed to the low-nibbles of two bytes and
provided with an offset by 0x60 e.g. 0x1F
=> 0x61 + 0x6F
b) 7bit data:
(0x0 to 0x7F) are provided with an
offset by 0x80, e.g. 0000011 => 0x83
c) ASCII data
=> 0x20 to 0x7E are transmitted
unencryptedly.