268 HEIDENHAIN Technical Manual MANUALplus 620
3.25.1 USB interface (USB 2.0)
X141, X142, X143,
X144
Pin layout for USB connection (Type A):
If a USB hub is connected to one of the USB ports, the maximum permissible
length of the USB cable (ID 624 775-xx) is reduced to 20 m.
USB hub The power supply for the USB hub must comply with EN 50 178, 5.88 require-
ments for "low voltage electrical separation."
USB connection (female) 4-pin Assignment
1+5 V
2USBP–
3USBP+
4 GND
If USB components that are connected to one of the USB ports require
more than 0.5 A, a separate power supply becomes necessary for these
components. One possibility is the USB hub (USB 2.0) from HEIDENHAIN
(582 884 02).
For more information on the USB interface, see "The USB Interface of the
Control (USB 2.0)" on page 1763.
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