Communication Functions Using The Rs-422A/485 Communication; Interface (/C3 Option); Functional Construction; Setting/Measurement Server - YOKOGAWA Vigilantplant mR10000 User Manual

1.2 Communication Functions Using the RS-422A/
485 Communication Interface (/C3 Option)

Functional Construction

Setting/Measurement Server

Modbus Slave

1-4
The recorder can be equipped with an optional RS-422A/485 communication interface.
For details on how to use the RS-422A/485 communication interface, see chapter 3.
The following figure shows the relationship between the communication function of the
recorder and the RS-422A/485 communication interface. Perform communication
according to the respective protocol.
* Protocol is a set of rules that two computers use to communicate via a communication line (or
network).
Application Setting/Measurement Server
Protocol
Interface
The functions are the same as those of the Setting/Measurement server of the Ethernet
interface. See page 1-1.
<Related Topics>
• RS-422A/485 communication interface settings: Section 3.5
• Commands: Section 4.2
• RS-422A/485 dedicated commands: Section 4.8
• Data output format: Chapter 5
• The Modbus protocol can be used to read the measured/computed data on your PC
by reading the input registers of the recorder. The communication input data can be
written or read by writing/reading the hold register of the recorder.
• For details on the Modbus function codes that the recorder supports, see section 3.4.
• This function can be used only when communicating via the serial interface (option).
• For a description on the settings required in using this function, see section 3.5.
Modbus master device
Data from slave device
Data to slave device
Modbus slave device
Communication functions of the recorder
Dedicated protocol
RS-422A/485
Connect the recorder and the
PC using a serial cable.
PC
Recorder
Modbus Slave
Modbus protocol
Serial communication
IM 04P01B01-17E