Yokogawa JUXTA M Series Digital Limit Alarms MVTK Manual do Utilizador descarregar pdf (Página 13)

2-1

IM 77J04J11-01E 1st Edition : 2006.08.25-00

2. Communication Specifications

The RS-485 communication interface has the PC link communication, Ladder com-

munication and MODBUS communication protocols.

Table 2-1 M Series Communication Specifications

Communication Hardware

2-wire RS-485 communication system

Communication Protocol

Specifications

PC link communication without checksum

PC link communication with checksum

MODBUS communication (ASCII mode)

MODBUS communication (RTU mode)

Ladder communication

Maximum Baud Rate

9600 bps

Terminal

Two-piece connector on the front panel: 1, 2, 3

Table 2-2 Types of Devices to be Connected

Connected Device

PLC (sequencer) (FA-M3

ladder communication module)

Example of Connected Device

PC, touch panel and PLC

(FA-M3 UT link module)

Communication Protocol

MODBUS communication

PC link communication

Ladder communication

General-purpose PC

General-purpose PC, FA-M3

and GP Series

General-purpose PLC

(sequencer)

2.1 RS-485 Communication Specifications

Table 2-3 RS-485 Communication Interface

Item

Compliant standard EIA, RS-485

Maximum number of devices to be connected 31

Communication system

Synchronization Asynchronous (start-stop)

No handshakingCommunication method

2-wire, half duplex

Maximum communication distance 1200 m

Baud rate 1200, 2400, 4800, 9600

Specifications

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 69 70

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