User Manual

TMCM-1311 V1.2 Hardware Manual (Rev. 1.12 / 2013-JUL-05) 17
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3.4.3 USB
For remote control and communication with a host system the TMCM-1311 provides a USB 2.0 full-speed
(12Mbit/s) interface. As soon as the USB-host is connected the module accepts commands via the USB
interface. The TMCM-1311 supports USB self powered operation with external power supply via the power
supply connector and USB bus powered operation without this external power supply.
USB BUS POWERED OPERATION
During USB bus powered operation only the core digital circuit parts - microcontroller and EEPROM - are
operational. Motor movements are not possible. This mode has been implemented in order to enable
configuration, parameter setting, read-out, firmware updates, etc. by connecting an USB cable between
the module and an USB-host. No additional cabling or external devices (e.g. power supply) are required.
Please note that the module might draw current from the USB +5V bus supply even in USB self powered
operation. This depends on the voltage level of this supply.