CUI Devices

│ SERIES: AMT21 │ DESCRIPTION: MODULAR ABSOLUTE ENCODER

date 09/10/2021

│ page 4 of 10

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RS485 INTERFACE EXAMPLES

Single character commands

Read Position: <node_address>

The read position command is the same as the node address which has a default value of 0x54 is sent and the response

is received with the low byte first. After removing the checksum the result is 0x39E4. For a 14-bit encoder nothing else is

required, the position is 14820 in decimal. However if this is a 12-bit encoder, the position must be shifted to the right 2

bits to throw away the low bits of the response. Therefore the position would be 3705 in decimal.

Read Turns (multi-turn encoders only): <node_address + 0x01>

The turns counter command is <node_address + 0x01>. By default the turns counter command is 0x55. The encoder

responds with the low byte first and includes check bits same as the read position command. The resulting number is a

signed 14 bit number. The response above is showing 1 turn.

Extended commands

Set Zero Position (single turn encoders only): <node_address + 0x02> <0x5E>

The zero set command is <node_address + 0x02> followed by <0x5E>. By default we send 0x56 and then 0x5E. The

encoder zero’s the position and immediately resets.

Encoder Reset: <node_address + 0x02> <0x75>

The reset command is <node_address + 0x02> followed by <0x75>. By default the command to reset the encoder is 0x56

0x75. The encoder performs and immediate reset.

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