User manual

Microgate MicroGraph LED User Manual Page 66 of 88
3.1.2 AUTOCONFIG COMMANDS
The following commands allow to autoconfigure the Row and Column address of the modular
display boards, if you have not done so in the setup menu before assembling them.
The frame format to send is slightly different from the text frame. As address identifier (instead of
A..Q or blank) the character '*' must be used (Dec. 42, Hex 2Ah).
The commands are two and must be sent in sequence, waiting until the end of the execution of
the first (the first one sets the same port baud rate for all). This can be carried out visually (the
display board writes OK when it is ready to receive the second command) or by reading the
response from the serial/Ethernet port. These are in fact the only two (bidirectional) commands
giving a response and more precisely can give an ACK in case of Acknowledgement (OK command)
or an ERR in case of Error.
Initialize AutoConfig
Command code
‘a’
Data area
Item
Length (bytes)
Notes
Baud Rate
Max 6
'1200', '2400', '4800', '9600', '19200', '38400', '38400',
'57600', '115200', '230400'
Responses
3
ACK | ERR
Set AutoConfig Parameters
Command code
‘b’
Data area
Item
Length (bytes)
Notes
Row
2
0 <=n<= 15 – 0 = Automatic
Column
1
0 <= n <= 4 – 0 = Automatic
Direction
1
0=Down, 1=Up
Responses
3
ACK | ERR
Example:
From PC to display board
From display board to PC
ESC * a 9600 ETX CHK
* a ACK (or * a ERR)
ESC * b 00 0 1 ETX CHK
* b ACK (or * b ERR)
The Direction parameter is very important in the case of multiple-row configurations (one display
board above the other). If the serial or Ethernet cable from the PC to the display board is