CARLO GAVAZZI EM21 - COMMUNICATION PROTOCOL V1 REV0 Manual de usuario descargar pdf (Pagina 23)

CARLO GAVAZZI

CONTROLS

SERIAL COMMUNICATION PROTOCOL

WM24-96

V1 R0

Page

5 HARDWARE SPECIFICATIONS

5.1 RS485/RS422 INTERFACE

General technical specifications Note

Baud rate 9600bps

Data format 8 data / 1 stop bit / no parity

Address 1 to 255

Broadcast Yes (address 0 with function 06)

Standard functions 04: Read function (max 12 words)

06: Write function (max 1 word)

Special functions Alarm output management A

Answer buffer 24+5 byte B

Writing protection Yes C

Identification code 18 (12h) D

Synchr. Time-out 3 chars E

Physical interface MAX1482

RX termination Jumper between Rx+ and T terminals

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

2-wire (RS485 interface)

Note:

A. It is possible to activate/deactivate a digital output (if available) writing a word in the proper

location.

B. With a single request maximum 12 words can be read from WM24.

C. It is possible to write in the ram and eeprom areas specified in the present protocol.

D. See paragraph 1.4 WM24-96 identification code.

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

the received frame.

F. 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 500ms

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 EM21 - COMMUNICATION PROTOCOL V1 REV0 Manual de usuario Pagina 23