Yaca: cabling
07. September 2010Verzeihung
Yaca, as the name suggests, is (currently, because 2 RFM12 modules were built in today) based on CAN, which needs an electrical bus topology. Cabling a house in bus topology isn't that easy, though. To make cabling easier and to make "branch lines" possible, the following pin/wire configuration has been chosen for the CAT5 cable used:
| pin | color | signal |
|---|---|---|
| 1 | brown | CANH |
| 2 | brown/white | CANL |
| 3 | green | CANH (back) |
| 4 | green/white | CANL (back) |
| 5 | orange | +VBUS |
| 6 | orange/white | -VBUS |
| 7 | blue | +5V |
| 8 | blue/white | 5V GND |
| 9 | shield wire | 5V GND (distribution side) |
VBUS, the bus supply voltage, is currently 20 V, but is planned to be raised to 40 V to reduce cable losses (a wire in 100 m CAT5 has 9 Ohms resistance). 40 V is the very maximum that can be used with the TS2576 switching voltage converters used at many places.
Current list of switching converters:
-
Distribution box in the laundry
ControlPanel: Pocket PC in the living room, in the CF card slot
PoolControl in the garage
The current bus connector is a common 2x5 pin header with 2,54 mm grid. The female connector is easy to crimp, the male part is easy to solder and both are easy to obtain and widely used.
On the green wire pair (pins 3+4), the bus comes back from wherever the cable went in the first place (branch line). This is the current bus cabling topology (values in brackets are the cable length marked on the cable, the cable distance between two places is the difference, the bus distance on branch lines is double the cable distance):
-
Start termination: Workshop (98 m)
Laundry - distribution box (84 m)
-
A (Workshop, MainPower)
B Laundry, CentralHeating (bridged)
C Kitchen (bridged, cable not crimped yet, 62705 m / TODO m)
D Living room, ControlPanel via TV set distribution (41 m / 49 m), ControlPanel is ~ 3 m from distribution
E Garage, PoolControl (54 m / 73 m)
F (Computers, YacaSerial) (74 m / 81 m)
ControlPanel connector
In the back of the Pocket PC, the connection diagram is as follows (counting starts from the direction of the card slots):
| pin | color | signal |
|---|---|---|
| 1 | orange/white | -VBUS |
| 2 | orange | +VBUS |
| 3 | brown | CANH |
| 4 | brown/white | CANL |
| 5 | green/white | CANL (back) |
| 6 | green | CANH (back) |
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