CARLO GAVAZZI EM21 - COMMUNICATION PROTOCOL V1 REV0 Manual de usuario descargar pdf (Pagina 8)

CARLO GAVAZZI

CONTROLS

SERIAL COMMUNICATION PROTOCOL

WM24-96

V1 R0

Page

2.1.2 Instantaneous variables reading

Example 1: Reading of a single variable: W1

Value request frame (8 byte):

01h 04h 02h 0Ch 00h 02h CRC CRC

Value answer frame (9 byte):

01h 04h 04h 0Eh 0Eh 00h 00h CRC CRC

Info request frame (8 byte):

01h 04h 02h 46h 00h 01h CRC CRC

Info answer frame (frame 7 byte):

01h 04h 02h 06h 1Fh CRC CRC

Stored value: 0E0Eh (3598 decimal)

Info value (P type): 06h

Variable value (W1): 3598 W

Example 2: Reading of a single variable: PF1

Value request frame (8 byte):

01h 04h 02h 27h 00h 01h CRC CRC

Value answer frame (7 byte):

01h 04h 02h A9h 00h CRC CRC

Stored value: A9h (-87 decimal)

Variable value (PF1): C 0.87

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CARLO GAVAZZI EM21 - COMMUNICATION PROTOCOL V1 REV0 Manual de usuario Pagina 8