In principle, USB interfaces have the following characteristics:
• Integrated power supply up to 500 mA for each socket, max. 1.2 A total.
• Maximum cable length 3 m (Length including the supply cable to the hub and the connected
terminal device; only 1 hub is permitted. It should be noted that some keyboards already have
a hub.)
Note
Cables that are too long can result in malfunctions or faults on the screen
Observe the following restrictions for the USB front interface for connecting operator panels
to the keyboard, mouse or USB FlashDrive:
• Maximum cable length: 1.8m
• Extension cables are not permissible
• Hot-plugging-capable devices are connected during operation and are identied
automatically.
Note
Correct identication is only guaranteed for USB I/Os that comply to 100% with the USB
specication.
Table 5-2 Assignment of the USB interface
Type A socket Type B socket Pin Name Type Remark
1 P5V_fused V + 5 V (fused)
2 Data-
B
Data -
3 Data+ Data +
4 GND V Ground (reference potential)
USB sticks
If you want to connect a USB ash drive to the USB interface, you can use a USB ash drive of
any memory size. It must, however, meet the following minimum requirements:
• File system: FAT16 or FAT32
• Partitioning: only in PC partition format (MBR)
USB sticks that deviate from these requirements have not been tested and may not be
recognized by the NCU.
Connection
5.1Pin assignment of the interfaces
TCU 30.3
34 Equipment Manual, 03/2023, A5E40874197B AD
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