The ORD-1 is a well known solution to run the DDX driver inside Rocrail for direct control to the rails. Ord-1 includes also S88 bus connections. MGv105 has no S88 bus, because in the MGV family of circuits, we use Loconet instead of S88.
This DDX booster is powerfull with 3A output. It is a booster because it uses only one DC circuit to make full swinging output.
A small processor will sense short circuit, and will be able to shut down the power directly.
Also Rocrail DDX is still able to control power on/off.
When USB-RS232 converter is used, the feed-back for power on/off is not supported.
For that purpose, two extra outputs are available to connect to Loconet.
The program in the PIC12F675 is only a few lines. After a short circuit has been detected, the PIC will shut off the output, and make LED4 keep flashing. Only after Rocrail (or others) shuts down the rail output, it is possible te restart.
Rocrail will handle (if outputs from J3 are connected to loconet) that a short circuit has occurred.
The program in processor is written with PicSimulator IDE from www.oshonsoft.com
|mgv105_pcb.pdf||The pcb layout|
|MGV105.bas||BASIC source of firmware|
This is important to know, specially because it demands a dedicated transformer, and NO ground wires connected from one transformer to another.