12 USB
Ports
The SCADAPack 350 controller has two USB 2.0 compliant ports, supporting both low-speed
(1.5Mb/s) and full-speed (12Mb/s). One of the ports allows the controller to act as a host, while the
second port allows connection to a USB host, such as a notebook computer. The two USB ports can
be used simultaneously.
The USB interface circuitry can be disabled to save power. Refer to section
for details to enable the power to the USB interface.
WARNING:
USB ports may be permanently used in non-hazardous applications. USB ports may
be used for corrective maintenance in locations classified as hazardous but are
known to be in a non-hazardous state.
12.1 USB
Connections
The connectors used for the USB ports are compliant with the USB specification.
12.1.1 Host
Port
The host port features a USB series “A” receptacle. For bus-powered USB devices, the host port can
provide up to 100mA at 5V. The following diagram shows the connections for the host USB port.
USB series “A”
receptacle
1. VBUS
2. D-
3. D+
4. GND
3
4
1
2
Figure 20: Host USB Port Connections
Note:
This port is not currently supported at this time
12.1.2 Peripheral
Port
The peripheral port uses a USB series “B” receptacle. A SCADAPack 350 will not draw any
significant power from the host over the USB peripheral port. The following diagram shows the
connections of the peripheral USB port.
USB series “B”
receptacle
2
4
1
3
Figure 21: Peripheral USB Port Connections
SCADAPack 350 Hardware Manual
February 14, 2007
45
