Chapter 2. CPU Features & Specifications
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PACSystems* RX7i, RX3i and RSTi-EP CPU Reference Manual
GFK-2222AD
USB 3.0 Interface
The USB ports are not functional at time of publication. Once functional, they will support the Removable
Data Storage Device features discussed in Section 2.1.8.
Two USB ports, using standard USB Type A connectors (Figure 2), are located on the faceplate below the
OLED display.
This pair of ports is protected with a 1.5A fuse. For normal operation, do not exceed 0.9 A per connector.
The USB overcurrent detection does not identify which port created the situation: it could be either one.
Remove the root cause of the overcurrent in order to permit normal operation.
Pinouts for the USB ports (Figure 4) are:
Pin#
Signal Name
1
USB_VCC
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2
USB-
3
USB+
4
GND
5
SSRX-
6
SSRX+
7
GND
8
SSTX-
9
SSTX+
The maximum
cable length for USB 3.0 cables is 3m (=118”) for Port 1 and 15cm (=6”) for Port 2.
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USB_VCC is limited to 1500mA by an electronic fuse shared by the two USB ports. For normal operation, do not exceed
900mA at this pin for either port.
