Your train is going into the next generation .. with ETHERNET!
This will be the ultimate solution for communication between Rocrail and LocoNet-I/O®.
Almost each in the market available computer now-a-days is equipped with an Ethernet connection.
The USB does not always seem to be the perfect solution as substitute for the RS232 Comm port.
The GCA101 is equipped with a special Ethernet connector.
It provides an electric isolation , which means that computer and your trains are not electrically connected together.
The standard Ethernet cable can be one of the two types. Either normal or 'crossed' cables are useful.
Connecting GCA101 to PC is best done by means of a router in between.
So your home network will be one way to do it.
If you do not like this situation, use a dedicated cheap router for it.
Direct connection GCA101 to PC is possible but requires a lot of experience with networking.
One important remark to old left-over routers:
Routers previously used at home with your previous Internet/ Tv provider, will experience problems with connection via UDP.
This is probably caused by the UDP channel inside the router, which should be opened by passwords/codes/pin numbers.
In this case, that router is unusable.
|Printed circuit + parts positions|
|Bill of materials|
|N.B. Only complete ordered kits will be supported!|
Two processors on this board are installed.
One to connect Ethernet to the standard SPI and the second as interface between SPI and Loco-I/O.
The unit is equipped with two Loco-I/O RJ12 connectors and two D-con-Loco-I/O connectors.
On board power switching power supply with 3 Amp output to be able to supply a large range of Loco I/O modules MGV50 I/O modules.
The necessary transformer should have minimum of 52 VA.
Power supply : between 15V and 30V dc or between 12V and 24V ac.
Transformer or adapter MUST be dedicated ONLY for GCA101. No other connections should be made to transformer!
Ignoring this can result in damage of GCA101 or connected periphery.
Unit is available as board only or as complete parts package, including programmed processor.
Ready built units will not be available.
Thanks to Robert Evers & Fred Jansen who have put much energy in getting the system up and running, you will finally be able to run Rocrail and Loco-I/O without USB and/or RS232.
On Linux flashing the firmware is easy with avrdude:
avrdude -F -pm168 -cstk500v2 -P/dev/ttyUSB0 -Uflash:w:MGV101_UDP_TEST.hex:a
The programmer ID is "mySmartUSB-Light" firmware version dependent: stk500v2 or avr910/911.
For Windows, just use the software which comes with the mySmartUSB-light.
One other programmer, which comes with a very large library wfor many different branches and types (including all Microchip processors) is MINIPRO TL866A.
At this moment available from GCA.
The three green leds in front are indicating different functions.
|3 (left)||ethernet receive / Loco-I/O transmit|
|4 (mid)||Loco-I/O receive|
|5 (right)||ethernet transmit|
|JP1||15 mA Current source Loco-I/O line|
|JP2||+12V to Railsync+|
Click here for a brief explanation about it.
GCA101 also can be used with TCP.
The standard address for that is 192.168.0.200.
Processor should be changed to ATmega328P.
Software is developed in Spain by Dani Guisado.
Firmware is downloadable here: https://github.com/ClubNCaldes/GCA101LbServer
Website of Dany is also interesting : http://www.clubncaldes.com/
|Firmware version: 2.10x|
The communication between Rocrail and the GCA101 is by the User Datagram Protocol. Therefor only the LNUDP LocoNet interface type is supported.
Setup Rocrail with the exact values shown below except for the Local IP address which is in most cases not needed.
The GCA101 own IP address is not used in the Rocrail setup.
This is the Multicast address to use for communication and must be set to the FIXED value of 126.96.36.199.
– The All Hosts multicast group addresses all hosts on the same network segment. –
The service port must be set to the FIXED value of 1235.
LNUDP is used as standard.
With different processor and firmware (see : https://wiki.rocrail.net/doku.php?id=mgv101-en#new_development_for_gca101 ), LNServer
is possible with TCP address 192.168.0.200.
Only required if the PC has more then one network interfaces installed; In all other cases: Leave empty!
IP address of the PCs network interface which is used for communication with the GCA101 to make sure the traffic runs on the right one.