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7.4 The USB 2.0 Interface
519
Functionality and
signal designations
USB uses packet-based communication over two differential data lines. This
reduces radiation and increases transmission reliability. USB provides signifi-
cantly higher data transfer rates than the previous external interfaces (parallel
/ Centronics, serial / RS-232, RS-422):
USB full speed of up to 480 Mbps
USB low speed of up to 12 Mbps
Conventional interfaces, such as the RS-232, are more suitable for time-critical
applications because they are not based on packets which reduce the transfer
rate (in case of packets with only a few bytes) or delay transmission (when col-
lecting bytes for filling a packet).
Only four wires of a USB cable are needed. Two for a power supply of 5 V (with
max. 500 mA / 2.5 W) and two for data transmission.
USB devices
on the control
The USB interface of the control allows for convenient and fast exchange of
data. You can connect USB block devices, such as memory sticks, hard disks,
CD-ROM drives, to your control via the USB interface without having to reboot
the system. The data media can be accessed immediately after connection.
The control supports the following USB block devices:
Floppy disk drives
Memory sticks
Hard disks
CD-ROM drives
The control supports USB devices with FAT/VFAT, NTFS, or ext2/ext3 file sys-
tems.
Structure of the USB cable
Note
It should generally be possible to connect all USB block devices with the
above-mentioned file system to the control. If you nevertheless encounter
problems, please contact HEIDENHAIN.
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