Watlow MICRODIN Manual de usuario descargar pdf (Pagina 92)

A.6 Watlow MicroDIN

Example: Run loop back test on controller at address 40 (0x28).

Sent: 28 08 55 66 77 88 31 B7

Received: 28 08 55 66 77 88 31 B7

Exception Responses

When a controller cannot process a command it returns an exception response

and sets the high bit (0x80) of the command.

0x01 illegal command

0x02 illegal data address

0x03 illegal data value

Packet returned by controller: | nn | nn | nn | nn nn |

∆∆∆∆∆

controller address (one byte)

command + 0x80

exception code (0x01 or 0x02 or 0x03)

CRC low byte

CRC high byte

Messages with the wrong format, timing or CRC are ignored. A read command

sent to an inactive parameter returns 0x0000.

Example: Exception 01 - Command 02 is not supported.

Sent: 01 02 00 01 00 02 A8 0B

Received: 01 82 01 81 60

Example: Exception 02 - The parameter at register 45 (0x002D) is inactive.

Sent: 01 06 00 2D 00 01 D8 C3

Received: 01 86 02 C3 A1

Example: Exception 03 - Cannot write 12,000 (0x2EE0) to register 7, out of

range, illegal data value.

Sent: 01 06 00 07 2E E0 24 23

Received: 01 86 03 02 61

Appendix

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Watlow MICRODIN Manual de usuario Pagina 92