CARLO GAVAZZI WM4-96 - PROGRAMMING Manual de usuario descargar pdf (Pagina 8)

CARLO GAVAZZI

CONTROLS

SERIAL COMMUNICATION PROTOCOL

WM4-96

V1 R3

Page

Read command request frame

Address Function Word address n° of words CRC

1 byte 1 byte 2 byte 2 byte 2 byte

From 1 to 255 04 01h C0h 00h 02h MSB LSB

Read command answer frame

Address Functi

n° byte

Value Value Value Value CRC

1 byte 1 byte 1 byte 1° byte 2° byte 3° byte 4° byte 2 byte

From 1 to 255 04 04 01C0h 01C1h 01C2h 01C3h MSB LSB

2.3 INSTANTANEOUS VARIABLES READING

Example 3: Reading of a single variable: W1

Value request frame (8 byte):

01h

04h

00h

08h

00h

02h

CRC

Value answer frame (9 byte):

01h

04h

00h

63h

8Dh

CRC

Info request frame (8 byte):

01h

04h

00h

E8h

00h

02h

CRC

Info answer frame (frame 9 byte):

01h

04h

07h

06h

00h

CRC

Stored value: 638Dh (25485 decimal)

Info value (P type): 06h

Since 9999<25485<99999, the inf2 value to be considered is 06+1=07 (11.11K)

Variable value (W1): 25.48 kW

Example 4: Reading of all the instantaneous variables:

All instantaneous values (+ info) request frame (8 byte):

01h

04h

00h

76h

CRC

All instantaneous values (+ info) answer frame (241 byte):

01h

04h

ECh

00h

01h

37h

07h

0Ah

03h

CRC

VL1-N stored value: 0137h (0311 decimal)

.....................

Info (V type) value: 07h

Info (A type) value: 07h

Info (P type) value: 0Ah

Variable value (VL1-N): 3.11 kV

Gross Automation (877) 268-3700 · www.carlogavazzisales.com · [email protected]

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