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SMR series Digital Interfaces for Single-Channel Radio Control

This page is present for legacy use: the SMR is no longer produced: please use a DMR-203

Two models are available;

SMR-102	Board only
SMR-122	Boxed

The SMR is a Single channel, Microprocessor, Radio control Interfaces for general purpose Radio-Control applications. It provides proportional motor speed control with an active failsafe system. The units are used extensively in high-power radio-control applications utilising 4QD‘s 4QD, Pro and NCC motor speed controllers.

The mechanical layout of the SMR-102 board allows it to be plugged directly into the input connectors of the NCC series controllers.

For other controllers the boxed version, SMR-122, should be used.

Features include proportional control of a single channel with an output resolution of 64 states over the full stick displacement. Switched output mode for use in applications requiring a Radio-Control Switch. An on-board signal validation routine and a failsafe system give stable operation and "power-down" of the output in the event of transmission loss or hardware failure. The interface has an optically isolated input for maximum reliability.

The two versions of the interface are:

Board version - SMR-102

for NCC series only Smr102

Boxed version - SMR-122

for all controllers SMX-121

The boxed version has a 6 way lead which connects direct to the input connector on all NCC, Pro and 4QD series controllers.

Features

Single Channel Radio Control Electronic Speed Control utilising RISC AVR Surface-mount Micro-controller.
64-State PWM (Pulse Width Modulated) Proportional Output.
Optocoupler on inputs.
Reverse Driver.
Zero Output Failsafe System.
Switched or Proportional Output Modes.
Signal Validation and Rejection for Noise Immunisation.
Low Power Consumption: powered from the controller.
Compact and Lightweight Design.

Specifications

Supply Voltage	5.7-32.0V*
Supply Current	4.7mA
Power Consumption	24mW

Output Method	2KHz PWM 0-100% Modulation
Output Voltage	4.3V PWModulated
Input Signal
Input Method	4-100Hz PWM 1.5mS Mark Centre [RC STD]
Input Voltage	3.2V - 5.5V Max
Input Resistance	50Kohm
Failsafe Parameters
Valid Input	0.7-2.3mS Mark on PWM Input (400Hz - 1.4kHz approx)
Fail Time-out	300mS
Fail Output	0V (Zero)
Physical Attributes
Operating Temperature	-40 - +90deg;C
Dimensions mm(")(max)	H 26.1(1.3) * W 35.6(1.4) * D 19.8(0.78)
Weight	38g

Instructions

The operating instructions explaining wiring and features are available for download in PDF format.

Suitable Controllers

The interface may be used directly with

We will possibly be able to issue instructions for use with our new Programmable-150 controller. Please ask.

It is possible that other controllers may be used but the interface is not designed for use with them so instructions are not provided.

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