CUI DEVICES | SERIES: AMT33 | DESCRIPTION: MODULAR COMMUTATION ENCODER

date 08/05/2022 | page 8 of 10

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Command

Action

Use

0

This command sends an ascii ‘0’ (hex value

0x30).

This zeros the encoder and sets the index at the current angular position along

with the rising edge of the commutation channel U. This position is stored in non-

volatile memory and will remain present until a zero command is set again or the

encoder is reprogrammed via the AMT Viewpoint™ application.

Q

This command sends an ascii ‘Q’ (hex value

0x51).

This command restarts the encoder as if it were power cycled.

APPLICATION NOTES

Pin

Description

Connection

TX_ENC+

This is the pin that the encoder transmits

serial data on.

Connect this pin to the receiver input of your serial/UART interface.

RX_ENC+

This is the pin that the encoder receives

serial commands on.

Connect this pin to your serial/UART interface transmitter output.

MCLRB

This pin is used to force the encoder into

reset for reprogramming via the AMT

Viewpoint™ application.

Connection of this pin is not required for the above serial commands.

45

Command: 0 (hex: 0x30, binary: 0b00001100)

Start

0123

Response: \r (hex: 0x0d, binary: 0b10110000)

Stop

Stop

7

TX_ENC+

Start

0123456

RX_ENC+

67

The AMT33 series encoder is designed to operate with a serial UART interface. This interface allows the encoder to be configured and programmed

by the AMT Viewpoint™ application. Along with programming, the AMT Viewpoint™ application uses the serial interface for diagnostics and motor pole

alignment. Below are instructions on how to use the serial interface for position zeroing.

Serial Commands

Table 1

Serial Pins

Table 2

Serial Timing Diagram

Figure 3

The serial interface operates at 115200 baud with 8 data bits, no parity, and 1 stop bit, and 1 start bit. This is the standard UART protocol. Data lines

TX_ENC+ and RX_ENC+ are high when inactive.

SERIAL INTERFACE

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