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date 06/21/2019

│ page 8 of 10

CUI Inc

│ SERIES: AMT33 │ DESCRIPTION: MODULAR COMMUTATION ENCODER

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

For more information, please visit the product page.