B&B Electronics Parallel Printer Card PIOC Manual de usuario descargar pdf (Pagina 29)

GHI Electronics,LLC USBwiz User Manual

1. USBwiz Functions

UP 0

Now you can preform any printer commands, such as reset.

PR 0

The actual print command PP, will accept up to 255 bytes of data for every transfer. You

can safely call the PP more than once.

PP 0>4

Get Printer Status Command PS is used to Get Printer Standard Status Byte which is

identical to status byte that is usually returned from Parallel Port printers.

6.6. USB Serial Devices

USBwiz supports many serial USB devices. Communication Device Class (CDC) is one of

them. This can be a USB modem or a cell phone. AT commands can be used to dial

numbers, send SMS messages and transfer data on some of the CDC USB modems.

Check your cellphone manual for a list of supported AT commands. Other serial devices

are Prolific, Silabs and FTDI serial (UART) to USB converters. Most USB GPS modems

out there use Prolific chipset. This allows you to connect a USB GPS to USBwiz. Same for

Silabs and FTDI chipsets. Many devices use one of these chips and therefore they can

communicate with USBwiz as easy as any other USB devices.

US 0>F>2850 Register an FTDI device at port 0

SW 0>4 Send 1234 to FTDI

6.7. Raw USB Access

Accessing a USB device is divided into three stages:

1. Enumeration stage: Includes USB addressing.

2. Learning Stage: Querying about the USB device and performing the required setup.

(Setup transfers, opening Pipes, ...).

3. Read/Write Pipes stage.

Example: Accessing a USB mouse:

Stage 1:

Assign a device handle 0 for the connected device on port 0,

UI 0>0

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B&B Electronics Parallel Printer Card PIOC Manual de usuario Pagina 29