User manual

TMCM-1110 stepRocker Hardware Manual (Ref. 1.08 / 2012-APR-04) 13

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3.5.2 USB

For remote control and communication with a host system the TMCM-1110 stepRocker provides a USB 2.0 full-

speed (12Mbit/s) interface (mini-USB connector). As soon as a USB-Host is connected the module will accept

commands via USB. The TMCM-1110 support USB self powered operation (when an external power is supplied

via the power supply connector) and USB bus powered operation, also (no external power supply via power

supply connector). During USB bus powered operation, only the core digital circuit parts will be operational.

That is, the microcontroller itself and also the EEPROM. Motor movements will not be possible. This mode has

been implemented in order to enable configuration / parameter setting / read-out, firmware updates etc. by just

connecting a USB cable between the module and a host PC. No additional cabling / external devices as e.g.

power supply etc. are required in that case.

Please note that the module might draw current from the USB +5V bus supply even in USB self powered

operation depending on the voltage level of this supply.

3.5.3 CAN (Retro-fit Option)

For remote control and communication with a host system the TMCM-1110 stepRocker can be equipped with a

CAN bus interface. Please note, that it is necessary to prepare the board with a CAN transceiver and the

according capacitor first (chapter 3.2.5.1).

For proper operation the following items should be taken into account when setting up a CAN network:

1. BUS STRUCTURE:

The network topology should follow a bus structure as closely as possible. That is, the connection

between each node and the bus itself should be as short as possible. Basically, it should be short

compared to the length of the bus.

c:>

node

- 1

node

Host

Slave Slave Slave

CAN

termination

resistor

(120 Ohm)

termination

resistor

(120 Ohm)

}

keep distance as

short as possible

Figure 3.7: CAN bus structure

2. BUS TERMINATION:

Especially for longer busses and/or multiple nodes connected to the bus and/or high communication

speeds, the bus should be properly terminated at both ends. The TMCM-1110 does not integrate any

termination resistor. Therefore, 120 Ohm termination resistors at both ends of the bus have to be

added externally.