Rockwell-automation 2071-Axx Kinetix 3 Component Servo Drive Serial Ho Manual de usuario descargar pdf (Pagina 30)

30 Rockwell Automation Publication 2071-RM001B-EN-P - April 2013

Chapter 2 Communication Protocol (RS-232/ASCII)

If the drive receives the host's command with a communication error (for

example, parity or checksum errors), the drive sends an NAK

. The host should

assume a communication error occurred if a response from the drive does not

occur within a time-out period (generally 200 ms).

If drive does not recognize the command, it sends a US

response.

Checksum

The checksum range consists of ID to Separator fields. Checksum is the ASCII

hex code of the least significant digit from the sum of hexadecimal codes in the

checksum range.

For example, this VER command has a checksum of 42 (ASCII hex code of B).

30H+31H+23H+56H+45H+52H+3AH = 1ABH

The ASCII hex code of B is 42.

However, this VER command response also has a checksum of 35 (ASCII hex

code of 5).

30H+31H+24H+56H+45H+52H+20H+31H+2EH+30H+32H+3AH = 295H

The ASCII hex code of 5 is 35.

Command STX01#VER: BETX

ASCII 2 3031235645523A423

Command STX01&VER 9. 02: 5ETX

ASCII 2 30312456455220392E30323A353

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 145 146

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Rockwell-automation 2071-Axx Kinetix 3 Component Servo Drive Serial Ho Manual de usuario Pagina 30