Yokogawa JUXTA M Series Digital Limit Alarms MVTK - Manual (Page 13)

<Toc> <Ind> <2. Communication Specifications >
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
PC
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 handshaking Communication method
2-wire, half duplex
Maximum communication distance 1200 m
Baud rate 1200, 2400, 4800, 9600
Specifications