TTControl Vision 312, Руководство пользователя

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6. SPECIFICATION OF INPUTS AND OUTPUTS
6.9.2 Functional description
The USB Host interface is compliant with the USB 2.0 standard.
Be sure to use an appropriate cable for the USB connection. For the USB data lines, a twisted pair con-
nection must be used. In a noisy environment the data line pair should be shielded separately. In this
case, connect the cable shielding to USB shield.
If the USB interface is used to connect a removable device, provide a connector compliant with the USB
standard. This ensures that the pins of the USB interface are connected in the correct order (first shield,
then ground (GND), then V
bus
, then the data lines), thus preventing the interface from getting damaged.
For power supply below 7.5 V, see section 6.1.2.1 .
6.9.3 Maximum ratings
Symbol Parameter Note Min Max Unit
L
max
Maximum cable length 1, 2 5 m
V
usb
Maximum voltage on V
bus
, D+, and D- -0.5 5.5 V
I
max
Maximum current on V
bus
500 mA
I
off
Overcurrent protection on V
bus
500 1000 mA
V
in-CMM
Input common mode range DC or AC-peak with line
frequency (max 60Hz) 3 -0.05 0.5 V
V
in-CMM
Input common mode range DC or AC-peak with line
frequency (max 60Hz) 4 0.8 2.5 V
Note 1 The maximum cable length depends on the type of cable used, the number of connec-
tors between the devices, the environment the cable is installed, as well as the USB
transmission speed mode used. As a rule of thumb, each connector pair decreases
the maximum cable length by 0.5 meters if a USB conform connector is used. If an
arbitrary connector is used, the length penalty will be higher.
Note 2 A USB high speed (HS) connection is more sensitive than a USB full speed (FS) or
low speed (LS) connection. Hence, the maximum possible cable length also depends
on the kind of peripheral connected to the USB interface.
Note 3 For High Speed USB.
Note 4 For Low Speed USB and Full Speed USB.
6.10 RS-232 interface
6.10.1 Pinout
Connector Pin no. Function
C1 25 RS-232 TX – serial interface output
C1 34 RS-232 RX – serial interface input
C1 33 RS-232 GND – serial interface ground signal
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Confidential and Proprietary Information
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Document Number:
D-156-G-02-001