CARLO GAVAZZI WM4-96 - PROGRAMMING Manual de usuario descargar pdf (Pagina 50)

CARLO GAVAZZI

CONTROLS

SERIAL COMMUNICATION PROTOCOL

WM4-96

V1 R3

Page

6 HARDWARE SPECIFICATIONS

6.1 RS485 INTERFACE

General technical specifications Note

Baud rate 1200, 2400, 4800, 9600bps

Data format 1 start / 8 data / 1 stop bit / no parity

1 start / 8 data / 1 stop bit / even parity

1 start / 8 data / 1 stop bit / odd parity

Address 1 to 255

Broadcast Yes (address 0 with function 06)

Standard functions 04: Read function (max 108 words)

06: Write function (max 1 word)

Special functions 80: Read from Flash memory (data-logging)

Answer buffer 264+5 byte A

Identification code 16 (10h) B

Synchr. Time-out 3 chars C

Physical interface MAX1482

RX termination Jumper between Rx+ and T terminals

Available connections 4-wire (RS422 half duplex interface) D

2-wire (RS485 interface)

Note:

A. With a single request maximum 132 words can be read from WM4.

B. See paragraph 1.4 WM4-96 identification code.

C. It is the time that must elapse without receiving any character before starting the analysis of

the received frame.

D. RS422 interface is managed with the same protocol of the RS485 one: in this way only the

half-duplex communication is allowed (TX and RX not simultaneous).

Timing characteristics for 4-wire communication msec

T response: max answering time 600ms

T response: typical answering time 100ms

T delay1: minimum time for a new query on the same address 10ms

T delay2: minimum time for a new query on a different address 10ms

T null: maximum interruption time on the request frame 3 char

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

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CARLO GAVAZZI WM4-96 - PROGRAMMING Manual de usuario Pagina 50