BlueBox IDTRONIC HF, Communication Protocol Manual

Page: 12 / 37

BLUEBOX Gen.2 HFM Page 12 of 37
In this case, the message from the ‘master’ command is composed of the byte
0x10 (code of the ‘inventory’ command).
In the following the sequence of the composition of the outgoing and incoming
buffer of the ‘master’ device will be graphically depicted.
For the transmission of this first data package the ‘master’ loads the second
byte of the header (length) and the data bytes of the command (in this case
only one) and then sets to ‘1’ the flag ‘Req tx’ for the ‘slave’.
1° Byte 2° Byte Data
0 0 0 0 0 0 0 1 01 10 OUT
T 1 0 0 0 0 0 0 IN
The ‘slave’ confirms the reception of the data packet setting to ‘1’ the flag ‘Ack
tx’.
1° Byte 2° Byte Data
0 0 0 0 0 0 0 1 01 10 OUT
T 1 0 0 0 0 0 1 IN
Consequently the ‘master’ will reset to ‘0’ the flag ‘Req tx’ and then also the
‘slave’ will reset to ‘0’ the flag ‘Ack tx’.
1° Byte 2° Byte Data
0 0 0 0 0 0 0 0 OUT
T 1 0 0 0 0 0 1 IN
1° Byte 2° Byte Data
0 0 0 0 0 0 0 0 OUT
T 1 0 0 0 0 0 0 IN
The ‘slave’ will set to ‘1’ the flag ‘Busy’ during the execution of the received
command.
1° Byte 2° Byte Data
0 0 0 0 0 0 0 0 OUT
T 1 0 0 1 0 0 0 IN
At the end of the execution, the ‘slave’ will answer to the ‘master’ sending the
readed transponder code.
The message consists of 2 data blocks because the code length is 20 bytes and
the data buffer can only support at most 14 bytes.
For the first data packet the ‘slave’ loads the second byte of the header
(length) and the data bytes of the first 14 data bytes of the answer and then
sets to ‘1’ the flag ‘More’ (another data packet will follow) and the flag ‘Req rx’
for the ‘master’.
1° Byte
2°
Byte
Data
0 0 0 0 0 0 0 0 OUT
T 1 0 0 0 1 1 0 0E
10 00 E0 04 01 00 01 02 03 04 E0 04 01 10
IN