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3.
Modbus RTU Protocol
The Modbus protocol was originally developed for Modicon controllers by Modicon Inc.
Detailed information related to the Modbus RTU protocol can be found at:
http://www2.schneider-electric.com/sites/corporate/en/products-services/automatio
n-control/automation-control.page.
more valuable information.
The PIR-130 module supports the Modbus RTU protocol, with communication Baud
Rates ranging from 1200 bps to 115200 bps. The parity, data bits and stop bits are
fixed as no parity, 8 data bits and 1 stop bit. The following Modbus functions are
supported.
Function Code
0x01
0x02
0x03
0x04
0x05
0x06
0x0F
0x10
0x46
Error Response
If the function specified in the message is not supported, then the module responds as
below. Note that the address mapping for the Modbus protocol is Base 0.
Byte
Description
00
Address
01
Function Code
02
Exception Code
Note:
If a CRC mismatch occurs, the module will not respond.
PIR-130-AC/DC User Manual Ver. 1.4.0, 2020/07/28
You can also visit
Description
Reads the Coils
Reads the Discrete Inputs
Reads Multiple Registers
Reads Multiple Input Registers
Writes a Single Coil
Writes a Single Register
Writes Multiple Coils
Writes Multiple Registers
Reads/writes the Module Settings
Length
(in Bytes)
1
1
1
http://www.modbus.org
Value
1 to 247
Function Code + 0x80
01
for
Section
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
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