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04/2010

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Comand 0x50: init_cal_md

This command causes the encoder to enter calibration mode. In this mode the coarse and fine devices are

repeatedly read and the position is recalculated. The period for reading these devices is about 500 microseconds

each since the transmitters have to be turned on and off and the devices have to stabilize before reading.

Comand 0x60: norm_md

This command causes the encoder to go back to normal tracking mode.

Command 0x70: set_zero_point

This command sets the current position to zero and saves this setting in the EEPROM. The host should

send nop_a5 repeatedly after sending this command, the response will be 0xa5 while update is

proceeding and eeprom_wr is the response when update is finished.

Comand 0x80,<byte_address>,<data>: eeprom_wr

This command causes the data to be written to the address given in <byte_address>. The address can be 0x00 to

0x7f for 128 bytes of data.

Comand 0x81,<ctl_code>,<data>: ctl_eeprom _wr

This command causes the <data> byte to be written to the offset given in <ctl_code>. Only certain offsets are

valid: 0xFF is the coarse adjust for the absolute position calculation (default 6), 0xFD is the MSB offset for zero

adjustment (default 0), 0xFE is the LSB offset for zero adjustment (default 0).

Comand 0x90,<byte_address>,0x01: eeprom_rd

This command causes the data in eeprom at the given address to be read and put in the output fifo.

The sequence is as follows:

1) issue read command, receive idle character

2) issue NOP, receive idle character or 0x90 (echo of read command)

3) repeat step 2 if it is an idle character

4) issue NOP and receive

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PART NUMBER:

DESCRIPTION:

AMT203

12 BIT ABSOLUTE ENCODER