This is an old revision of the document!
Table of Contents
CAN-GCA Overview
Professional boards & kits
Only Kits bought from CANBUS - A universal layout control system
Firmware Copyright
Copyright© Mike Bolton and Gil Fuchs.
Example Network
Bus termination
The very high noise immunity is achieved by ensuring that the differential impedance of the bus is maintained at a very low level using low value resistors (120 ohms) mounted at each end of the bus.
| On all CAN-GC boards this termination resistor is already mounted and can be activated by setting a jumper. |
Connection cable
The best suitable cable for connection between all CAN-GCx modules is CAT-5 cable, mostly known as CAT-5 Patchkabel cable.
Almost any computershop or DIY Market sells this cable for pretty low prices. (e.g. Reichelt 4X2 AWG26/7-10)
| DB9 Pin | Function | CAT-5 color | Remark |
|---|---|---|---|
| 1 | GND | brown/white | |
| 6 | GND | green/white | mandatory¹ |
| 2 | RailSync- | orange/white | ORD-3 |
| 7 | CANL | blue/white | mandatory¹ |
| 3 | Loconet | green | optional for mixed systems |
| 8 | CANH | blue | mandatory¹ |
| 4 | RailSync+ | orange | ORD-3 |
| 9 | Not used | ||
| 5 | +12V supply | brown | mandatory¹ |
¹) Minimal cable configuration.
Pin 2 and 4 are only needed when ORD-3 booster is used in the same system.
Changing wire colours could cause errors.
Links
Reichelt Elektronik
Alternative cable
| For testing and small layouts. |
Standard full wired male to female extension RS232 cables are allowed, but up to a certain limit. (e.g.: Reichelt AK2300)
It is never experienced how many can be used. A few will not disturb the communication, but it is not able to conduct the full 3 Amp of the CAN-GC1(e).