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ENTTEC Pty/Ltd Tel +61 3 9819 2433

ACN 089 252 791 Fax +613 9819 2733

ABN 94 388 357 479 Web: www.enttec.com

PO Box 282

Kew, Vic, 3101

Australia

DMX USB Pro Widget API Specification 1.44

Purpose

This document specifies the interface requirements for PC based application programs to use the

DMX USB Pro Widget to send or receive DMX512 packets.

PC Setup

Install the VCOM FT245BM device driver on the PC. Since the driver is a virtual COM port, the

baudrate setting used to open this COM port is a dummy value, and does not control the USB

communication speed.

Application Message Format

The PC based application program communicates with the Widget via the FTDI driver. The table

below specifies the general format of the messages between the application program and the FTDI

driver.

Size In Bytes Description

1 Start of message delimiter, hex 7E.

Label to identify type of message. See below for

value.

Data length LSB. Valid range for data length is 0 to

600.

1 Data length MSB.

data_length Data bytes.

1 End of message delimiter, hex E7.

Firmware Varieties

The Widget firmware version identifies the set of application messages that are supported by the

firmware. The Widget will ignore any unsupported application messages. The following table

shows the available firmware varieties.

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Sommario

Pagina 1 - Firmware Varieties

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Pagina 2 - Application Messages

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Pagina 3

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Pagina 4

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Pagina 5

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Pagina 6

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Pagina 7

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Pagina 8 - RDM Implementation Details

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Pagina 9

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