CARLO GAVAZZI UDM 40 - PROGRAMMING Instrukcja Użytkownika Pobierz pdf (Strona 22)

CARLO GAVAZZI

CONTROLS

SERIAL COMMUNICATION PROTOCOL

UDM - USC

V1 R1

Page

5 HARDWARE SPECIFICATIONS

5.1 RS485 INTERFACE

General technical specifications

Baud rate 4800, 9600, 19200, 38400bps

Data format 8 data / 1 stop bit / no parity

Address 1 to 255

Broadcast Yes (address 0 with function 06)

Standard functions 04, 03: Read function (max 13 words)

06: Write function (max 1 word)

Special functions 08: Test device

Identification code 26,27,28 (1Ah,1Bh,1Ch)

Synchr. Time-out 3 chars

Physical interface MAX1482

RX termination Jumper in BO SX module

Available connections 4-wire (RS485 half duplex interface)

Timing characteristics for 4-wire an 2-wire communication msec

T response: max answering time 600ms

T response: typical answering time 60ms

T delay1: minimum time for a new query on the same address 3 char

T delay2: minimum time for a new query on a different address 3 char

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

APPLICATION NOTES

1. If the instrument does not answer within the “max answering time”, it is necessary to repeat the

query. If the instrument does not answer after 3 consecutive queries, it must be considered as

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CARLO GAVAZZI UDM 40 - PROGRAMMING Instrukcja Użytkownika Strona 22