Reference Hardware Design

Table of Contents

• Overview
• Pin Assignments
• Transceiver Hardware

A reference hardware design.

Overview

The reference design is based on the PIC 32 Ethernet Starter Kit (DM320004-2) which uses a MX795F512L MCU. The PIC32 USB Starter Kit III (DM320003-3) is cheaper and should also work. The latter uses a MX470F512L MCU so you may need to change some settings.

You'll also need an I/O breakout board: PIC32 I/O Expansion Board (DM320002)

Pin Assignments

On the DM320004-2 starter kit, with the DM320002 I/O board, the pin assignments are as follows:

Use	Pin Name	J1 Connector	J11 Connector	Port	Bit
UART RX	SCM1A/RF2	88	41	-	-
UART TX	SCM1B/RF8	90	43	F	8
TX Enable	PMPD11/RF0	18	7	F	0
RX Enable	PMPD10/RF1	16	8	F	1
Input Capture	IC2	54	26	-	-
RDM Identify	OC4/RD3	40	18	D	3
RDM Mute	SS1/IC2/RD9	52	23	D	10

If you use a different MCU, you can change the pin assignments in system_settings.h

Transceiver Hardware

To build a basic DMX / RDM Transceiver module, you'll need:

• 1 x MAX481CPA
• 2 x 562 Ω resistor
• 1 x 133 Ω resistor
• 1 x 0.1 μF capacitor
• 1 x 5 pin XLR connector
• 1 x Breakout board connector, or another means of attaching to J11 on the
• 2 LEDs (Mute & Identify status) I/O expansion board.

Note

This transceiver is not isolated.

The DMX / RDM Transceiver module