SAME SKY | SERIES: AMT22 | DESCRIPTION: MODULAR ABSOLUTE ENCODER

date 09/12/2024 | page 3 of 9

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Commands:

Read Position

Hex command sequence: 0x00 0x00

The command to read position is 0x00, 0x00 because the encoder will always respond with the current position when SPI is accessed. The

encoder observes the second byte for extended commands.

Extended Commands:

Reset Encoder

Hex command sequence: 0x00 0x60

The encoder responds with the current position over the transmission then immediately resets. Observe the power on time when using this

command. Encoder must be stationary to power back on.

Set Zero Point (single-turn encoders only)

Hex command sequence: 0x00 0x70

The encoder responds with the current position over this transmission then saves the current position into memory and performs a reset.

Encoder must be stationary for this command. Observe the power on time when using this command.

Read Turns (multi-turn encoders only)

Hex command sequence: 0x00 0xA0 0x00 0x00

The encoder responds with position during the transfer of the first two bytes. The encoder responds with the current turn value in the

second two bytes. The resulting number is a signed 14 bit number. This value is not retained between power cycles. After a power cycle, the

value is reset to zero.

Chip select must be held low for the entire four byte transfer, and T

B should be observed between each byte.

SERIAL INTERFACE (CONTINUED)

The AMT22 encoder operates in two modes: programming, and SPI mode. To enter programming mode for use with AMT Viewpoint™ the

slide on the bottom of the encoder must be moved to the programming position. Slide the switch to the left position before connecting

encoder to AMT Viewpoint™. Once configuration in AMT Viewpoint™ is completed, disconnect encoder and return switch to the standard run

mode position before connecting encoder to system. Switch must be in proper mode for programming or SPI before power is connected to

device.

AMT VIEWPOINT™ OPERATION

A

Run Mode

Program Mode

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