ServSwitch™ DKM
134
Parameter Description
Command byte in the range of 0x40...0x6F (see the list of allowed commands below)
Data Bytes a) Binary data: in order to prevent that, during the transmission of binary
data, control statements or 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...0x7F) are provided with an offset by 0x80, e.g.
0000011 => 0x83
c) ASCII-data => 0x20… 0x7E are unencrypted transmitted
(Special-)Character ACK 0x06
NAK 0x15
STX 0x02
ETX 0x03
CR 0x0D
ESC 0x1B
HTAB 0x09
LF 0x0A
Sequence of data communication
ServSwitch™ DKM
Control CPU
Sending a command
Acquiring command
Processing the command,
Blocking further commands
a) Errors occurred <NAK>
b) No errors
<ACK>, <EC
HO>
c) Optional: reply telegram with data
a) repeat telegram
b) next command
c) receive and process the replay-
telegram
The Serial Interface can be blocked while an OSD has been opened.
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