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Modbus
161
Modbus
Overview
This analyzer adopts the Modbus serial communication protocol developed by Modicon Inc.,
which is widely used as a type of fieldbus.
This chapter describes the Modbus address inside the analyzer and its function.
For the following items, refer to the relevant site/section.
Detailed specification of Modbus protocol
Modbus Organization Website
http://www.modbus.org/
Signal exchange on the terminal block
“ External input/output” (page 11)
Serial communication setting (Machine ID, Baudrate, Parity)
“ COMMUNICATION SET” (page 108)
Software overview
Function code
Item
Description
Remarks
Physical I/F
RS-485
(Option) Two-wire RS-232C
When the optional RC-232C is selected, it is necessary
to change the hardware settings.
Serial Setting
Bit/s
9600/19200/38400
Data bit
8
Parity
None/Even/Odd
For “None”, the stop bit is 2;
for “Even/Odd”, the stop bit is 1.
Stop bit
1/2
flow control
None
Protocol
Modbus
RTU mode
Code number
Explanation
0x01
Read Coils
0x02
Read Discrete Inputs
0x03
Read Holding Registers
0x04
Read Input Registers
0x05
Write Single Coil
0x06
Write Single Register
0x0F
Write Multiple Coils
0x10
Write Multiple Registers
0x17
Read/Write Multiple Registers
Содержание TPNA-500
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