MCC MIIC-203 Guida Utente Scaricare il pdf (Pagina 13)

2.1 USB Connector

The USB connector provides connection from the I

C adapter to a USB port on the

host computer or self-powered USB hub. The iPort/USB operates as a high-power

(>100 mA) bus-powered USB device, with limited target system power. Additional

target system power can be provided via an optional external power supply.

2.1.1 Virtual Communications Port (VCP)

The iPort/USB provides a Virtual Communications Port (VCP) interface via a host

computer driver. Install the iPort Utility Pack (available on CD or online) and plug

the iPort/USB into a USB port. Windows will automatically load the driver and

instantly create a new com port (COMn) on your computer. The VCP hides the

complexities of a USB physical interface. Application programs running on the host

computer communicate with the iPort/USB via the standard Windows

Communications Application Program Interface (API).

Communication signals included in the VCP interface include:

• TX - Transmit Data from the Host Computer to the iPort/USB.

• RX - Receive Data from the iPort/USB to the Host Computer.

• RTS - Request to Send from the Host Computer to iPort/USB.

• CTS - Clear to Send from the iPort/USB to the Host Computer.

2.2 +5VDC Power Jack

The iPort/USB is a bus-powered USB device. When deriving power from the

Universal Serial Bus only, a limited amount of power is available to a target system

via +5V wire in the I

C Interface Connector. Additional power for a target system

can be provided via the +5VDC Power Jack. When connected to the +5VDC Power

Jack, an optional external power supply will remove all I

C Bus target system

power load from the USB and replace it with power from the external power

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MCC MIIC-203 Guida Utente Pagina 13