Manual
12.2 USB
for printer GPT-467x and all controller types
The USB protocol is part of the GeBE bootloader and the GeBE firmware.
It corresponds to the USB specification V2.0 for full speed. The USB interface is implemented as a bidirectional USB
printer class. The operating mode is "Self Powered".
Suspend / resume operation is not supported.
The USB stack was expanded by a vendor-specific command of a hardware RESET, which acts like unplugging and
plugging in the USB connector. In addition, the flags of the GET port status message printer status can be patched. GeBE
provides an SDK for operation, which makes access to the USB interface just as easy as with the serial RS232 interface.
Further information can be found in the Manual DRMAN-SDK-E and the software manual SoMAN-0793.
Figure 34
The USB input is protected against overvoltage and overcurrent.
F50 :
resetable PTC Polyfuse 200 mA/9 V
V50 :
varistor
D50:
USB protection element SRV05-4
IEC 61000-4-2 (ESD):
Air 15 kV, contact 8 kV
IEC 61000-4-4 (EFT):
40 A, 5/50 ns
IEC 61000-4-5 (Surge):
12 A, 8/20 µs
Caution note for plugging in an USB printer:
If the USB cable is used and the positive pole of the power supply plug is connected first, the power circuit of the printer power
supply unit is connected via the USB grounding instead of its own power ground and the printers input capacitors are charged in
pulses. This inrush current spike can be over 20A. This current causes a voltage drop via the impedance of the USB line and the
input filter in the ground path of the printer, which is found as a host input as a positive impulse against the ground there.
Voltages > 7.5 V have been measured. An unprotected USB will be destroyed as soon as a breakthrough voltage of approx. 7 V is
reached.
Cable length of max. 2 m with cable cross section AWG24 for VUSB and GND. GeBE cable :GKA-570-2000
→
GeBE Elektronik und
phone
+49.89.894141-0
GeBE-document-no. GPT-467x-C32-E-MAN-V1.0-1001
Feinwerktechnik GmbH
fax
+49.89.894141-33
date
May 19, 2021
Beethovenstrasse 15
page 44 | 112
82110 Germering
Our general terms of business are to be applied.
Germany
www.gebe.net
Errors and changes reserved.
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