halogenek / acs Goto Github PK

The use of optical fiber was a bad idea. Better to use bottom emitting LEDs on front panel.

Programming the USB PD ICs is difficult with no pull up resistors present on the power supply card. It would be easier to add them on the board with jumpers.

After running code from 3bd4e93 U4 exploded.

Add QR codes, names, revisions, links to github repository on the power supply card PCBs.

The first interface used in this system is UART through RS485. There is no data frame format standard available so i suggest to use 8 bit UART packets on top on RS485 and then construct a bigger data frame containing:

• destination address
• number of bytes (size of data)
• n bytes of payload
• n bytes of crc (depending on the amount of bytes sent)

destination address: the card hardware address selected depending on the slot number the card is inserted
number of bytes: the number of bytes of data sent in this frame (1-254)

Payload

The first byte of the payload can be used for selecting the right instruction and we can divide the address space into two section. Numbers from 0 to eq. 32 could be used for standard commands common for all cards (ping, what are you, on/off etc.). Numbers from 32 to 254 could be reserved for this particular card (for example in a voltage source card the commands could be: 32 - channel on/off, 33 - set voltage etc.)

This concept will be easy to implement on embedded hardware and on a PC.