Yokogawa JUXTA VJ Series Limit Alarms - Manual (Page 13)

<2. Communication Specifications >
2-1
IM 77J01J11-01E
2. Communication Specifications
The RS-485 communication interface has the PC link communication, Ladder com-
munication, and MODBUS communication protocols.
Table 2-1 VJ Series Communication Specifications
Communication Hardware 2-wire RS-485 communication system
Communication Protocol
Specifications PC link communication without sum check
PC link communication with sum check
MODBUS communication (ASCII mode)
MODBUS communication (RTU mode)
Ladder communication
Maximum Communication Rate 9600 bps
Terminal Terminal numbers: 2, 5, 6
020001E.EPS
Table 2-2 Types of Devices to be Connected
Devices to be Connected
PC
PLCs (sequencers) and FA-M3
ladder communication module
Example of Connected Devices
PC, graphic panels, and PLCs
(FA-M3’s UT link modules)
Communication Protocol
MODBUS communication
PC link communication
Ladder communication
General-purpose PC
General-purpose PC, FA-M3,
and GP Series
General-purpose PLCs
(sequencers)
020002E.EPS
2.1 RS-485 Communication Specifications
Table 2-3 RS-485 Communication Interface
Item
Standard EIA, RS-485, Compatible
Maximum number of devices to be connected 31
Communication system
Synchronization Asynchronous (start-stop)
No protocol Communication protocol
2-wire, half duplex
Maximum communication distance 1200 m
Communication rate 1200, 2400, 4800, 9600
Specifications
020101E.EPS
3rd Edition : Oct. 15, 2007-00