mergCBUS
- Setup
  - CANID
  - Sub-Library
  - Device
  - Host/Port
  - Short events
  - Fastclock
  - Command Ack
  - FONFOF
  - SoD
  - Slot purge time
  - Loader time
- Addressing
- Resources

mergCBUS

Content → Command Stations → mergCBUS

Node Setup
CAN-GCx Modules and Command Station
- CAN-GC1e Ethernet Interface
  - RC-CAB Android CAB Application
- CAN-GC1 Serial-USB Interface
- CAN-GC2 16 port programmable I/O
- CAN-GC3 DCC Command Station
- CAN-GC4 RFID Concentrator
- CAN-GC5 Stationary Throttle
- CAN-GC6 4 Channel servo controller
- CAN-GC7 Fast clock
- CAN-GC8 Display driver for dynamic text
USB Port mapping (Optional)
Protocol

”mergCBUS is really an 'open source' version of LocoNet but is much faster and uses CAN which is very reliable.”

Setup

CANID

The CANID used for the CANUSB and CANRS.

Sub-Library

The connected CAN nterface:

Type	BPS	Kit code	Manufacturer	Remark
TCP/IP	10/100 MBPS	CAN-GC1e	GCA Peter Giling	Preferred.
USB	500 KBPS	CANUSB	MERG	Preferred by MERG. The 12V version can be used in combination with the CAN-GCA line.
Serial	230400	CAN-GC1	GCA Peter Giling	Uses binary responses to improve through put. (Not MERG compatible.)
Serial	115200	CANRS	MERG	Deprecated; It is not fast enough to keep up with CBUS at full speed!

Device

The serial device used for the CAN interface.

Kit code	Windows	Linux	Remark
CANUSB	COM5…COMn	/dev/ttyUSB0…/dev/ttyUSBn
CAN-GC1, CANRS	COM1…COM4	/dev/ttyS0…/dev/ttySn	An USB-RS232 converter can also be used. (Tested)

Host/Port

The hostname and port for the CAN-GC1e interface.

Short events

Use the short version of the accessory events; Event number only. (Recommended)
The long events are based on node number and event number.

Fastclock

Send fast clock packets on the CBUS.
It is recommended to set this enabled in case of using a TCP/IP connection to prevent idle timeout disconnection.

Highly recommendable.
Activates the command acknowledgment handshake.
A next command can only be send if the interface did acknowledged the previous command.
This handshake prevents loss of commands due buffer overflow. (10/100MBit → 125kBit)
Other manufacturers, like Lenz, are also using such a handshake on there Ethernet interfaces.

Only the CAN-GC1e version 1.c is capable of handling this acknowledgment when this option is activated in the firmware.

FONFOF

Use the OPC_DFON/OPC_DFOF instead of OPC_DFUN. (Not implemented by CANCMD.)

SoD

“Start of Day” address for query all input states.
This must be programmed as event in all input nodes which should report.

Slot purge time

CS timeout for updating DCC mobile decoders.
If a loco becomes idle before this time out a keep alive command is send to the CS.
:!: The hardware purgetime is 20 seconds, so this value should be set to less then 20 to assure the slot is not purged during automatic runs!

Loader time

Deprecated: No longer maintained.
Time in ms between sending bootloader lines to a node.

Addressing

mergCBUS addressing is FLAT, only the bus and address values are used; Port values are used in case the address value is zero.

Rocrail	mergCBUS	Range	Remark
-	CAN ID	0…127	Unique number within a CAN segment to be used in the CAN transport layer. This is the low part of the CAN Message Identifier* without priority bits.*
Bus	Node number	0…65535	Used for long events and programming. This must be set unique for all modules.
Address	Event number	0…65535
Port	Event number in case Address is zero. This is discouraged.	0…65535	Must be zero for correct mapping if the address field is used.
Gate	Added to the address of output objects.	0,1	This is needed for signal pattern support.